diff --git a/.coveragerc b/.coveragerc
index 02df6f45..1760fef3 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -8,6 +8,7 @@ omit = */kibot/docopt.py
        */kibot/mcpyrate/*
        */kibot/PyPDF2/*
        */kibot/svgutils/*
+parallel = true
 
 [report]
 exclude_lines =
diff --git a/.github/workflows/pythonapp.yml b/.github/workflows/pythonapp.yml
index ca004166..2f24ccf8 100644
--- a/.github/workflows/pythonapp.yml
+++ b/.github/workflows/pythonapp.yml
@@ -49,8 +49,14 @@ jobs:
         python3-coverage erase
         # Create the caches with macros
         python3-coverage run -a src/kibot --help-outputs > /dev/null
-        pytest-3 --durations=0 --test_dir output
+        # Individual run for specific tests
         # pytest-3 --log-cli-level debug -k "test_ibom_parse_fail" --test_dir output
+        # Run the 90% faster tests (under 3 s)
+        # Do it in parallel
+        pytest-3 -v --durations=0 -m "not slow" -n 2 --test_dir output
+        # Run the slowest at the end and exit on the first error
+        pytest-3 -v --durations=0 -m slow -x --test_dir output
+        python3-coverage combine
         python3-coverage report
         python3-coverage html -d output/htmlcov
     - name: Store results
diff --git a/Makefile b/Makefile
index 4e307775..e75d807b 100644
--- a/Makefile
+++ b/Makefile
@@ -38,6 +38,7 @@ lint: doc
 test_tmp: lint
 	$(PY_COV) erase
 	$(PYTEST)
+	$(PY_COV) combine
 	$(PY_COV) report
 
 test: lint
@@ -46,7 +47,9 @@ test: lint
 	rm -f example.kibot.yaml
 	rm -f tests/.local
 	$(PY_COV) erase
-	$(PYTEST) --test_dir output
+	$(PYTEST) -m "not slow" -n 2 --test_dir output
+	$(PYTEST) -m "slow" --test_dir output
+	$(PY_COV) combine
 	$(PY_COV) report
 	$(PY_COV) html
 	x-www-browser htmlcov/index.html
@@ -58,6 +61,7 @@ test1:
 	rm -f tests/.local
 	$(PY_COV) erase
 	$(PYTEST) --log-cli-level debug -k "test_bom_ok" --test_dir output
+	$(PY_COV) combine
 	$(PY_COV) report
 	$(PY_COV) html
 	#x-www-browser htmlcov/index.html
@@ -77,7 +81,8 @@ test_docker_local_1:
 		/bin/bash -c "flake8 . --count --statistics ; python3-coverage run -a src/kibot --help-outputs > /dev/null; pytest-3 --log-cli-level debug -k 'test_print_pcb_svg_simple_2' --test_dir output ; $(PY_COV) html; chown -R $(USER_ID):$(GROUP_ID) output/ tests/board_samples/ tests/.config/kiplot/plugins/__pycache__/ tests/test_plot/fake_pcbnew/__pycache__/ tests/.config/kibot/plugins/__pycache__/ .coverage htmlcov/"
 	#$(PY_COV) report
 	#x-www-browser htmlcov/index.html
-	rm .coverage
+	# The coverage used in the image is incompatible
+	$(PY_COV) erase
 
 test_docker_local_1_ki6:
 	rm -rf output
@@ -86,7 +91,7 @@ test_docker_local_1_ki6:
 	# Run in the same directory to make the __pycache__ valid
 	# Also change the owner of the files to the current user (we run as root like in GitHub)
 	docker run --rm -v $(CWD):$(CWD) --workdir="$(CWD)" setsoft/kicad_auto_test:ki6 \
-		/bin/bash -c "flake8 . --count --statistics ; python3-coverage run -a src/kibot --help-outputs > /dev/null; pytest-3 --log-cli-level debug -k 'test_kicad_conf_user' --test_dir output ; $(PY_COV) html; chown -R $(USER_ID):$(GROUP_ID) output/ tests/board_samples/ tests/.config/kiplot/plugins/__pycache__/ tests/test_plot/fake_pcbnew/__pycache__/ tests/.config/kibot/plugins/__pycache__/ .coverage htmlcov/"
+		/bin/bash -c "flake8 . --count --statistics ; python3-coverage run -a src/kibot --help-outputs > /dev/null; pytest-3 --log-cli-level debug -k 'test_dep_pytool' --test_dir output ; $(PY_COV) html; chown -R $(USER_ID):$(GROUP_ID) output/ tests/board_samples/ tests/.config/kiplot/plugins/__pycache__/ tests/test_plot/fake_pcbnew/__pycache__/ tests/.config/kibot/plugins/__pycache__/ .coverage htmlcov/"
 	#$(PY_COV) report
 	#x-www-browser htmlcov/index.html
 
@@ -98,8 +103,9 @@ test_docker_local:
 	# Also change the owner of the files to the current user (we run as root like in GitHub)
 	docker run --rm -v $(CWD):$(CWD) --workdir="$(CWD)" setsoft/kicad_auto_test:latest \
 		/bin/bash -c "flake8 . --count --statistics ; python3-coverage run -a src/kibot --help-outputs ; pytest-3 --test_dir output ; $(PY_COV) html; chown -R $(USER_ID):$(GROUP_ID) output/ tests/board_samples/ .coverage htmlcov/"
-	$(PY_COV) report
-	x-www-browser htmlcov/index.html
+	# $(PY_COV) report
+	# x-www-browser htmlcov/index.html
+	$(PY_COV) erase
 
 test_docker_local_ki6:
 	rm -rf output
@@ -109,6 +115,7 @@ test_docker_local_ki6:
 	# Also change the owner of the files to the current user (we run as root like in GitHub)
 	docker run --rm -v $(CWD):$(CWD) --workdir="$(CWD)" setsoft/kicad_auto_test:ki6 \
 		/bin/bash -c "flake8 . --count --statistics ; python3-coverage run -a src/kibot --help-outputs ; pytest-3 --test_dir output ; $(PY_COV) html; chown -R $(USER_ID):$(GROUP_ID) output/ tests/board_samples/ .coverage htmlcov/"
+	$(PY_COV) combine
 	$(PY_COV) report
 	x-www-browser htmlcov/index.html
 
@@ -124,7 +131,7 @@ docker_shell:
 
 single_test:
 	rm -rf pp
-	-$(PY_COV) run -a src/kibot --help-list-outputs > /dev/null
+	-$(PY_COV) run src/kibot --help-list-outputs > /dev/null
 	-$(PYTEST) --log-cli-level debug -k "$(SINGLE_TEST)" --test_dir pp
 	@echo "********************" Output
 	@cat pp/*/output.txt
diff --git a/pytest.ini b/pytest.ini
index 1708edf4..6423a6c4 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,2 +1,5 @@
 [pytest]
 python_files = tests/test_plot/test_*.py
+markers =
+    webtest: mark a test as a webtest.
+    slow: mark test as slow.
diff --git a/tests/test_plot/test_dep_downloader.py b/tests/test_plot/test_dep_downloader.py
index 90486027..0c777a48 100644
--- a/tests/test_plot/test_dep_downloader.py
+++ b/tests/test_plot/test_dep_downloader.py
@@ -9,6 +9,7 @@ import coverage
 import yaml
 import logging
 import importlib
+import pytest
 import shutil
 import subprocess
 import sys
@@ -120,6 +121,7 @@ def test_dep_gs(test_dir, caplog, monkeypatch):
     os.remove(os.path.join(ctx.output_dir, bin_dir, 'gs'))
 
 
+@pytest.mark.slow
 def test_dep_convert(test_dir, caplog, monkeypatch):
     """ Check the convert_downloader """
     # Create a context to get an output directory
diff --git a/tests/test_plot/test_ibom.py b/tests/test_plot/test_ibom.py
index eff74d9b..ce8984af 100644
--- a/tests/test_plot/test_ibom.py
+++ b/tests/test_plot/test_ibom.py
@@ -9,10 +9,11 @@ For debug information use:
 pytest-3 --log-cli-level debug
 
 """
-import os
-import re
 import json
 import logging
+import os
+import pytest
+import re
 from . import context
 from utils.lzstring import LZString
 from kibot.misc import (BOM_ERROR)
@@ -87,6 +88,7 @@ def test_ibom_all_ops(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_ibom_variant_1(test_dir):
     prj = 'kibom-variante'
     ctx = context.TestContext(test_dir, prj, 'ibom_variant_1', BOM_DIR)
diff --git a/tests/test_plot/test_misc.py b/tests/test_plot/test_misc.py
index 9ee6021c..8d6239a5 100644
--- a/tests/test_plot/test_misc.py
+++ b/tests/test_plot/test_misc.py
@@ -31,6 +31,7 @@ import os
 import re
 import shutil
 import logging
+import pytest
 import subprocess
 import json
 from . import context
@@ -742,6 +743,7 @@ def check_makefile(ctx, mkfile, prj, dbg, txt):
     ctx.search_err(r'Wrong character in file name `(.*)/test_v5-top\$.svg')
 
 
+@pytest.mark.slow
 def test_makefile_1(test_dir):
     prj = 'test_v5'
     ctx = context.TestContext(test_dir, prj, 'makefile_1')
@@ -752,6 +754,7 @@ def test_makefile_1(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_makefile_2(test_dir):
     prj = 'test_v5'
     ctx = context.TestContext(test_dir, prj, 'makefile_1')
@@ -898,6 +901,7 @@ def test_cli_order(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_qr_lib_1(test_dir):
     prj = 'qr_test/qr_test'
     ctx = context.TestContext(test_dir, prj, 'qr_lib_1', POS_DIR)
@@ -959,6 +963,7 @@ def test_report_simple_1(test_dir):
     ctx.clean_up(keep_project=True)
 
 
+@pytest.mark.slow
 def test_report_simple_2(test_dir):
     prj = 'light_control'
     ctx = context.TestContext(test_dir, prj, 'report_simple_2', POS_DIR)
@@ -1117,6 +1122,7 @@ def test_annotate_pcb_tbrl_small_grid(test_dir):
                    {'C1': '1u', 'C2': '2u', 'R1': '2', 'R2': '1', 'C3': '3u', 'C4': '4u', 'R3': '3', 'R4': '4'})
 
 
+@pytest.mark.slow
 def test_gencad_1(test_dir):
     prj = 'gencad'
     ctx = context.TestContext(test_dir, prj, 'gencad_1')
@@ -1133,6 +1139,7 @@ def test_gencad_1(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_quick_start_1(test_dir):
     """ Very naive test to see if it doesn't crash """
     prj = 'light_control'
@@ -1172,6 +1179,7 @@ def test_quick_start_1(test_dir):
     ctx.expect_out_file(os.path.join('Browse', 'light_control-navigate.html'))
 
 
+@pytest.mark.slow
 def test_netlist_classic_1(test_dir):
     prj = 'light_control'
     dir_o = 'Export'
@@ -1180,6 +1188,7 @@ def test_netlist_classic_1(test_dir):
     ctx.expect_out_file(os.path.join(dir_o, prj+'-netlist.net'))
 
 
+@pytest.mark.slow
 def test_netlist_ipc_1(test_dir):
     prj = 'light_control'
     dir_o = 'Export'
diff --git a/tests/test_plot/test_preflight.py b/tests/test_plot/test_preflight.py
index 0f5c15ed..caae208a 100644
--- a/tests/test_plot/test_preflight.py
+++ b/tests/test_plot/test_preflight.py
@@ -13,15 +13,17 @@ For debug information use:
 pytest-3 --log-cli-level debug
 
 """
-import os
-import logging
-import re
 import json
+import logging
+import pytest
+import os
+import re
 from subprocess import run, PIPE
 from . import context
 from kibot.misc import DRC_ERROR, ERC_ERROR, BOM_ERROR, CORRUPTED_PCB, CORRUPTED_SCH, EXIT_BAD_CONFIG
 
 
+@pytest.mark.slow
 def test_erc_1(test_dir):
     prj = 'bom'
     ctx = context.TestContext(test_dir, prj, 'erc', '')
@@ -31,6 +33,7 @@ def test_erc_1(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_erc_fail_1(test_dir):
     """ Using an SCH with ERC errors """
     prj = 'fail-erc'
@@ -49,6 +52,7 @@ def test_erc_fail_2(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_erc_warning_1(test_dir):
     """ Using an SCH with ERC warnings """
     prj = 'warning-project'
@@ -60,6 +64,7 @@ def test_erc_warning_1(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_erc_warning_2(test_dir):
     """ Using an SCH with ERC warnings as errors """
     prj = 'warning-project'
@@ -130,6 +135,7 @@ def test_drc_time_out(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_update_xml_1(test_dir):
     prj = 'bom'
     ctx = context.TestContext(test_dir, prj, 'update_xml', '')
@@ -149,6 +155,7 @@ def test_update_xml_1(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_update_xml_fail(test_dir):
     """ Using a dummy SCH """
     prj = '3Rs'
diff --git a/tests/test_plot/test_print_pcb.py b/tests/test_plot/test_print_pcb.py
index 2abb5c05..6ee54cad 100644
--- a/tests/test_plot/test_print_pcb.py
+++ b/tests/test_plot/test_print_pcb.py
@@ -9,6 +9,7 @@ pytest-3 --log-cli-level debug
 
 """
 import logging
+import pytest
 from . import context
 PDF_DIR = 'Layers'
 PDF_FILE = 'bom-F_Cu+F_SilkS.pdf'
@@ -16,6 +17,7 @@ PDF_FILE_B = 'PCB_Bot.pdf'
 PDF_FILE_C = 'PCB_Bot_def.pdf'
 
 
+@pytest.mark.slow
 def test_print_pcb_simple(test_dir):
     prj = 'bom'
     ctx = context.TestContext(test_dir, prj, 'print_pcb', PDF_DIR)
@@ -25,6 +27,7 @@ def test_print_pcb_simple(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_print_pcb_svg_simple_1(test_dir):
     prj = 'bom'
     ctx = context.TestContext(test_dir, prj, 'print_pcb_svg')
@@ -36,6 +39,7 @@ def test_print_pcb_svg_simple_1(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_print_pcb_svg_simple_2(test_dir):
     """ Check the portrait version is OK """
     prj = 'bom_portrait'
@@ -48,6 +52,7 @@ def test_print_pcb_svg_simple_2(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_print_pcb_refill_1(test_dir):
     prj = 'zone-refill'
     ctx = context.TestContext(test_dir, prj, 'print_pcb_zone-refill')
@@ -57,6 +62,7 @@ def test_print_pcb_refill_1(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_print_pcb_refill_2(test_dir):
     """ Using KiCad 6 colors """
     if context.ki5():
@@ -69,6 +75,7 @@ def test_print_pcb_refill_2(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_print_variant_1(test_dir):
     prj = 'kibom-variant_3_txt'
     ctx = context.TestContext(test_dir, prj, 'print_pcb_variant_1')
@@ -81,6 +88,7 @@ def test_print_variant_1(test_dir):
     ctx.clean_up(keep_project=True)
 
 
+@pytest.mark.slow
 def test_print_pcb_options(test_dir):
     prj = 'bom'
     ctx = context.TestContext(test_dir, prj, 'print_pcb_options', PDF_DIR)
@@ -91,6 +99,7 @@ def test_print_pcb_options(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_print_wrong_paste(test_dir):
     prj = 'wrong_paste'
     ctx = context.TestContext(test_dir, prj, 'wrong_paste', PDF_DIR)
@@ -101,6 +110,7 @@ def test_print_wrong_paste(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_pcb_print_simple_1(test_dir):
     prj = 'light_control'
     ctx = context.TestContext(test_dir, prj, 'pcb_print_2')
diff --git a/tests/test_plot/test_print_sch.py b/tests/test_plot/test_print_sch.py
index 371502fa..c8a98476 100644
--- a/tests/test_plot/test_print_sch.py
+++ b/tests/test_plot/test_print_sch.py
@@ -12,6 +12,7 @@ pytest-3 --log-cli-level debug
 import os
 import logging
 import coverage
+import pytest
 from . import context
 from kibot.misc import (PDF_SCH_PRINT, SVG_SCH_PRINT)
 from kibot.kicad.v5_sch import Schematic, SchFileError, DrawPoligon, Pin
@@ -25,6 +26,7 @@ NI_DIR = 'no_inductor'
 cov = coverage.Coverage()
 
 
+@pytest.mark.slow
 def test_print_sch_ok(test_dir):
     prj = 'bom_no_xml'  # bom has meta data, here we test no meta-data
     ctx = context.TestContext(test_dir, prj, 'print_sch')
@@ -34,6 +36,7 @@ def test_print_sch_ok(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_print_sch_fail(test_dir):
     prj = 'print_err'
     ctx = context.TestContextSCH(test_dir, prj, 'print_sch')
@@ -42,6 +45,7 @@ def test_print_sch_fail(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_print_sch_svg_ok(test_dir):
     prj = 'bom_no_xml'  # bom has meta data, here we test no meta-data
     ctx = context.TestContext(test_dir, prj, 'print_sch_svg')
@@ -51,6 +55,7 @@ def test_print_sch_svg_ok(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_print_sch_svg_fail(test_dir):
     prj = 'print_err'
     ctx = context.TestContext(test_dir, prj, 'print_sch_svg')
@@ -97,6 +102,7 @@ def test_sch_variant_ni_2(test_dir):
     check_l1(ctx)
 
 
+@pytest.mark.slow
 def test_print_sch_variant_ni_1(test_dir):
     """ Using a variant """
     prj = 'test_v5_wks'  # Is the most complete, contains every KiCad object I know
@@ -109,6 +115,7 @@ def test_print_sch_variant_ni_1(test_dir):
     ctx.clean_up(keep_project=True)
 
 
+@pytest.mark.slow
 def test_print_sch_svg_variant_ni_1(test_dir):
     """ SVG using a variant """
     prj = 'test_v5'  # Is the most complete, contains every KiCad object I know
@@ -121,6 +128,7 @@ def test_print_sch_svg_variant_ni_1(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_print_sch_variant_ni_2(test_dir):
     """ Using a filter """
     prj = 'test_v5'  # Is the most complete, contains every KiCad object I know
diff --git a/tests/test_plot/test_step.py b/tests/test_plot/test_step.py
index 92a1aa24..537a22d8 100644
--- a/tests/test_plot/test_step.py
+++ b/tests/test_plot/test_step.py
@@ -9,6 +9,7 @@ pytest-3 --log-cli-level debug
 
 """
 import os
+import pytest
 from glob import glob
 from . import context
 
@@ -17,6 +18,7 @@ STEP_DIR = '3D'
 # STEP_FILE = 'bom.step'
 
 
+@pytest.mark.slow
 def test_step_1(test_dir):
     prj = 'bom'
     ctx = context.TestContext(test_dir, prj, 'step_simple', STEP_DIR)
@@ -31,6 +33,7 @@ def test_step_1(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_step_2(test_dir):
     prj = 'bom_fake_models'
     yaml = 'step_simple_2'
@@ -44,6 +47,7 @@ def test_step_2(test_dir):
     ctx.clean_up(keep_project=True)
 
 
+@pytest.mark.slow
 def test_step_3(test_dir):
     prj = 'bom'
     ctx = context.TestContext(test_dir, prj, 'step_simple_3', STEP_DIR)
@@ -53,6 +57,7 @@ def test_step_3(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_step_gl_env(test_dir):
     prj = 'bom'
     ctx = context.TestContext(test_dir, prj, 'step_gl_env', STEP_DIR)
@@ -67,6 +72,7 @@ def test_step_gl_env(test_dir):
     ctx.clean_up()
 
 
+@pytest.mark.slow
 def test_step_variant_1(test_dir):
     prj = 'kibom-variant_3'
     ctx = context.TestContext(test_dir, prj, 'step_variant_1')
@@ -78,6 +84,7 @@ def test_step_variant_1(test_dir):
     ctx.clean_up(keep_project=True)
 
 
+@pytest.mark.slow
 def test_render_3d_variant_1(test_dir):
     # Text variables to ensure they are rendered.
     # Traces
diff --git a/tests/utils/context.py b/tests/utils/context.py
index d76cc3a6..cd60a117 100644
--- a/tests/utils/context.py
+++ b/tests/utils/context.py
@@ -276,7 +276,7 @@ class TestContext(object):
             f.write('Dummy file\n')
 
     def do_run(self, cmd, ret_val=None, use_a_tty=False, chdir_out=False):
-        cmd_base = [COVERAGE_SCRIPT, 'run', '-a']
+        cmd_base = [COVERAGE_SCRIPT, 'run']
         if chdir_out:
             cwd = os.getcwd()
             cmd_base.append('--rcfile='+os.path.join(cwd, '.coveragerc'))