Obviously the problem is not lag or what exactly you do.
The problem is that these popup messages are shown for, per Serancha, 1.6 seconds each. So if you kill 200 spiders, the popups will keep showing for up to 5 minutes. If you gift 30 items to someone real fast, it will take up to, say, half a minute to stop showing up after you're done. Same goes for items looted, bought and listed in CS, boss & arena countdowns, whatever.
It shows immediately in the chatbox, but the popups are delayed, until all are shown, one by one.
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