I personally believe loading time should be removed from the world record, as some people's computers and internet are slower than others and this helps level the playing field.

i will thinking about that

OP is correct, it should be allowed to remove the number of seconds on each loading timer in the run

Which technical method we could use for do that ?

You can use frame timing to calculate when the time should start and when the time should end.

https://slashinfty.github.io/yt-frame-timer/