The site seems to be experiencing heavy lag.

[DangerMouse]

Is this a normal occurrence?

[adum]

hm, i don't see it. anyone else?

[Jyrki63]

I have this same problem. I suspect that it started after a certain Firefox update. There is some kind of a memory leak (possibly a bug in FF). Continued use of the site makes FF hog more and more memory. Viewing the solutions in particular leads to FF hogging over 1GB of mem, running out of free mem, and then resorting to whatever tricks it can, and slowing down to a crawl.

My system: Windows 7, Firefox version 57 (64-bit)

The reason I suspect FF rather than anything on this site is that FF's memory usage goes gradually up on other sites (e.g. a math site I frequent) as well.