hello everyone ,
well idk where to post my idea ( MOD move this post to the right place )
so i was thinking where the lag comes from xD
and i found out that the lag comes from the background picture idk why idk how
and im sure 100%
so my idea is :
to add some option in the settings to change the background picture to some color ( green white black … )
and there is another idea to improve the first idea ( improve the option )
and its to make the option ( selection tool ) 
*- Color : black white blue green yellow … ( or maybe to write the RGB 255.255.255 )
*- Alpha : 0.1 to 1 (min-max)
thats is my idea so 
hope u like every one
thx for reading