(kinda off topic) will turning off cancollide be better for preformance?

i have this tree mesh. does it reduce lag to turn its cancollide property off and put a part in the middle (so people cant walk through) because roblox doesnt have to render its physical propertys? or is it just useless?

Short answer: no.

Long answer: no. Turning off canCollide doesn't reduce lag at all. And adding the extra part in the middle is just 1 more part the game has to handle, which will only increase the lag.