Firestorm(?): Weird delay when editing prims, including resizing and editing texture offset

[LilithServil]

https://i.gyazo.com/0e8ff32de5bd69daaabb0438405bfe3a.mp4

This .mp4 above best shows what I mean. I've been on a hiatus for months-- did something happen? Is this some setting I can tweak or something more? I don't think it's my settings causing it as nothing has changed, I run SL at a comfortable 60 fps on the upper end of High but I've also noticed strange things like flexiprims "stuttering" instead of moving smoothly. Any ideas? This is causing some awkward issues while building or even retexturing things.