Very very slow buffer switching

[nick rothwell]

It takes 2 or 3 seconds to switch from one buffer to another. That's a lot of CPU cycles. Any idea what's going on? It might be Clojure/cider-related, but it's slow even switching between README files. It's been slow for a while, but this latest beta seems to have made it worse.

I'm on BETA27, Emacs 24.5.1 (MacPorts).

[Sean Corfield]

I’ve only seen this happen (with 1.0beta27) if I’ve a) had Emacs open for several days and b) been doing a _lot_ of magit operations across multiple branches. Usually I notice magit operations getting slower first, then gradually most things get slower. M-x kill-emacs and a restart cures it.

Do you see memory usage increase over time for Emacs?

Is it fast when you first start it up? i.e., does it slow down over time?

Sean

[nick rothwell]

OK - yes, seems fast on a restart; will keep an eye on it. I've been suspecting magit as well.

I was seeing a two-second CPU spike on buffer change, suggesting it's not a memory problem directly (unlikely with 16GB of RAM and an SSD), but will keep an eye on memory usage as well.