[XP] Screen tone and lag

Hello there!

I noticed RMXP lags in a 'many events' map IF screen tone has other values than (0,0,0,0), FPS falls to 20....
So i tried Amaranth's anti-lag script. With this, my events don't cause lag anymore, but
it strangely fails to fix the very screen tone issue (still 20FPS);
whereas it runs perfectly when tone is (0,0,0,0)
, which is annoying since I want visual effect in my game.

Is there a way to change game screen tone without such problems? Thanks you.

Low opacity picture tinting the screen?

Thanks for your tip!