converting from 4.6 to 4.8 huge fps drop

I converted my project from 4.6 to 4.8 and everything went pretty well (had to modify some code here and there but thats all) In 4.6 i had like 65-70fps on my maps and now i barely have 25fps with 4.8, any idea what causing this?

Could be a ton of things. I would recommend going through all the 4.7 and 4.8 release notes and see which ones are related to your project.