Affected version of GregTech: 6.14.11
I noticed recently while I’m holding any GregTech 6 tool (specifically tested with a Thorium Pickaxe, Shovel, Axe, Saw, and Tartarite Mining Drill (HV)) and hold down the right mouse button I get an immediate FPS drop (to about 3-10 frames per second) that lasts until I release the right mouse button. I first noticed this when using a Saw to debark logs, but further testing reveals this happens regardless of the type of block you’re aiming the tool at, and even occurs while aiming at nothing.
I also tested and determined this only happens with GT6 tools - other items (from vanilla Minecraft, GT6, and other mods) don’t have this problem.
I tested and observed this problem both in the overworld (where my FPS is always somewhat low) and in Random Things’ Spectre Dimension (where my FPS is always very high, due to the lack of mobs, tile entities, and blocks that need to be rendered).
I don’t have any further insights as to why this might be happening, unfortunately. I’m not sure if this is something that only occurs with my particular assortment of mods, or if it’s strictly a GregTech-related issue.
I did some more testing and noticed it doesn’t occur when I use my Thorium Shovel on a Burning Box (Solid, Invar). This makes me think the FPS drop occurs when the mod tries but fails to find a special use for the tool.