Two things I've noticed: the lag in single player is directly correlated to the number of recipes, total, that are shown in the current filter. For example, show all recipes, hit "c", and there is a bunch of lag. hit "h" and there is less lag, hit "a" and basically none. Repeat that sequence with only craftable recipes, though, and the performance is about the same at each step. (It's actually bad enough to lose keystrokes, BTW, in my game. Though I have two "extra craftable things" mods installed, so way more than the vanilla recipe count.)
Second, those extra furniture mods tend to have combined stations (eg: table and workbench, forge and anvil, etc) that offer the functions of both. These work correctly with the crafting interface out of the box, which is great, and means a much nicer experience for me...