(Note: This probably applies to 1.9 also but I am filing it on 2 because that's where I am testing)

To reproduce, do the following, and BE AWARE THAT THESE STEPS MAY CRASH YOUR BROWSER.

1) Create new disposable course
2) Add a glossary
3) Import the attached 1,000-entry glossary (note - although the attached example is fake, this is not an unrealistic glossary size - we have several courses using larger)
4) Return to course page

Assuming you don't have glossary auto-link on, the 'Recent activity' block will appear with all 1,000 glossary entries shown. This is poor behaviour. I would expect either:

A) Recent activity shows 'Admin user / Imported 1,000 entries' instead of showing each one individually.
or
B) If there are more than, say, 5 new entries then the glossary falls back to just showing '968 new glossary entries'
or
C) If there are more than, say, 5 new entries then the glossary displays the first 5 and then '(... and more ...)' or something

If you have glossary auto-link on, step 4 will crash your browser, presumably because it tries to actually apply the filter (which performs poorly with 1,000 entries, I will file another bug about that) a thousand times and maybe adds some javascript for each one or whatever, I don't know. However, I suspect that if a limit were placed on the number displayed, this would fix the problem anyway.

(note: by 'crash your browser' I mean, peg its CPU at max; I left it for a minute - Firefox, IE7 - but it didn't finish.)