UltraBullet Rating Changes

Is there a separate way the chess.com does rating changes (after a win/draw/loss) for ultra bullet games? I did my first one (15s) and noted that I only gained 3 elo.

Just curious

Chess.com uses the Glicko system for calculating ratings I believe.   If you play a lot of games at a certain time control, eg. bullet, I think your Ratings Deviation will be low, and your rating will not fluctuate much.   If a player doesn't often play at a particular time control, their RD will be high, and their rating will jump around a lot.

The rating changes for 15 seconds and less were nerfed after some users were able to use it (fairly) to get up to 3300 bullet; now it is something like +3/+1/-1 W/L/D if you play up 200 points.

Ah that could well be, as well.