It's usually lag. If that happens, check your latency (the small bar next to your inventor button). Lag has been and still is a huge issue in Diablo 3 when encountering huge packs of mobs. There are some ways to work around it (avoid big pulls when fighting a Health Link pack, turn off damage numbers, get rid of area damage if you're playing support)... but it's never gonna go away entirely.
Let's hope it gets better in 2.4.1.
Lag has nothing to do with your PC, your specs should be more than enough to run Diablo fluently, and the number of mobs encountered has nothing to do with your computer as all calculation is done on Blizzard's servers anyways.
It's usually lag. If that happens, check your latency (the small bar next to your inventor button). Lag has been and still is a huge issue in Diablo 3 when encountering huge packs of mobs. There are some ways to work around it (avoid big pulls when fighting a Health Link pack, turn off damage numbers, get rid of area damage if you're playing support)... but it's never gonna go away entirely.
Let's hope it gets better in 2.4.1.
Lag has nothing to do with your PC, your specs should be more than enough to run Diablo fluently, and the number of mobs encountered has nothing to do with your computer as all calculation is done on Blizzard's servers anyways.