Some mods with toolbar addons cause FPS drops

[hendrack]

So I noticed some mods, those that add buttons to toolbars cause stutter. I played 2 months with horrible FPS and told myself I have to live with it. By chance I removed the wider contracts mod and installed Contracts Window+, my FPS skyrocketed! I've installed all kind of fluff like Astronomers Pack etc, my FPS was still high.

Then I installed AmpYear Power, I noticed some FPS drop again, but not that bad, I can still play fine.

Any ideas what can cause this?

Edited July 4, 2015 by hendrack

[sarbian]

Most likely the mod does something each frame that could be done only one. Hard to tell without looking into the code in detail.