good
from 600 i got to 900 in 2 months

I've gotten 400 in 4 months (350 to 750). I think it is easier at lower elo
it depends on what you mean by easier. the opponents are much weaker, and so it is easier to improve since it requires less study to get better than people, however everyone still struggles at their own level, and just because it is lower quality chess then others it is still difficult for some to improve. I was stuck at 4-500 for a long time.
hi i got 300 points up in 2 months