Documentation/Labs/StartupTimeImprovement

Current performance

These data are collected after Slicer has been started at least once on the workstation.

• Default options

$ time ./Slicer --python-code "slicer.app.quit()"

Number of loaded modules: 135

real	0m21.097s
user	0m19.070s
sys	0m1.570s

• Disable CLI modules

$ time ./Slicer --disable-builtin-cli-modules  --python-code "slicer.app.quit()"

Number of loaded modules: 65 

real	0m12.693s
user	0m11.412s
sys	0m0.727s

• Disable Loadable modules

$ time ./Slicer --disable-builtin-loadable-modules  --python-code "slicer.app.quit()"

Number of loaded modules: 111 

real	0m18.483s
user	0m16.720s
sys	0m1.149s

• Disable Scripted modules

$ time ./Slicer --disable-scripted-loadable-modules  --python-code "slicer.app.quit()"

Number of loaded modules: 93 

real	0m14.348s
user	0m12.449s
sys	0m1.385s

• Disable CLI and Scripted modules

$ time ./Slicer --disable-builtin-cli-modules --disable-scripted-loadable-modules  --python-code "slicer.app.quit()"

Number of loaded modules: 23 

real	0m5.676s
user	0m4.545s
sys	0m0.636s

Current performance with python disabled

Patch: Call this->quit() at the end of qSlicerApplication::handleCommandLineArguments()

• Default options

$ time ./Slicer --disable-python

Number of loaded modules: 93 

real	0m12.596s
user	0m11.166s
sys	0m0.935s

• Disabling CLI modules

$ time ./Slicer --disable-python --disable-builtin-cli-modules

Number of loaded modules: 23 

real 	0m4.201s
user	0m3.449s
sys	0m0.252s

• Disabling Loadable modules

$ time ./Slicer --disable-python --disable-builtin-loadable-modules

Number of loaded modules: 70 

real	0m10.375s
user	0m9.175s
sys	0m0.788s

• Disabling ALL modules

$ time ./Slicer --disable-python --disable-modules

Number of loaded modules: 1 

real	0m2.158s
user	0m1.465s
sys	0m0.178s