List of "slow" bullet hells?

[AntiFritz]

I wonder, isn't Ketsui slow enough to qualify?

I thought ketsui was pretty fast myself..

[Obiwanshinobi]

Bullet hell shmups generally tend to have slow bullets (the most generic feature I can think of). >>List od "fast" bullet hells<< would interest me more (other than Dangun Feveron and DOJ).
I don't think Dragon Blaze and Gunbird 2 qualify. Those two play a lot like earlier Psikyo games... with just a few more bullets displayed at once and a bit smaller hitboxes to compensate.

[Obscura]

Obiwan, give Air Gallet a try.

[Obiwanshinobi]

I don't recall Air Gallet being Cave-rich in bullets, but admittedly, I might have played it only once or twice and never went too far.
DP Hong Kong version has got some pretty fast bullets early on from what I remember.