Buildcraft version: 7.99.12
Forge version: 2561
Link to crashreport or log (on pastebin or gist, please don't put the entire log here) :
Singleplayer/multiplayer: Multiplayer

Additional information:
Just only when placing down the Auto Workbench, FPS gets about cut in half, with like 3+ of them, game is practically unplayable. Not sure what info to give you beside of that, let me know if you have questions.

oh right my bad, at the time there where issues with how slot handlers worked and detecting changes, seems i forgot to go back and fix fix that, it shoudn't be affecting fps though, only tps

It also ran on the client, which is run in the same thread as the renderer

hmm that's a oversight on my part then, it shoudn't run that on the client at all

Looks like the new autoworkbench tick() function is taking a lot longer than it should...

Looks like someone thought it was a good idea to check the crafting slots every tick for a new recipe.

what fps? 1 fps?

@ecolortest if you placed down enough, eventually you'll reach 1fps