Hi, I'm having a technical issue when playing with tModLoader 0.9.1 installed - every time that a menu or other type of UI is up on the screen (such as the Item/NPC browsers from the Cheat Sheet mod) Terraria's FPS drops to 15-20 from 45 and the game becomes incredibly laggy. The lag goes away once the menus/UI are closed and not being drawn on the screen anymore.
I can confirm that it works fine on my laptop; my desktop is the one with this issue. Desktop specs: Core i5 processor, 16 GB RAM, and Radeon 6900 2 GB video card.
Does anyone have any idea as to why this issue is occurring? Further testing showed that its caused by rendering any sort of menu on the screen; if I press F11 to turn off all UI elements, my FPS skyrockets back to 60, but turning them back on drops FPS to 15-20 again. I can confirm that this is not an issue with vanilla Terraria as I can play that without any lag or other issues. I've already uninstalled and reinstalled .NET Framework 4.5.2, XNA Framework 4.0 and my video card driver, to no avail. I need help with this as I cannot figure out why it only happens with tModLoader's Terraria.exe file.