WowAce

In Classic use LibInstantHealth (GitHub) to get faster health updates via combat log.

Quote from the developer:
"This addon parses the combat log events and adjusts the health early/instantly; normally health updates only after a 300ms-delay. The problem is that with LibHealComm the incoming healing of others is delayed up to 200ms + latency or more, meaning that with this addon it is almost always the case that the incoming heal is still showing for about 200ms when the health was already updated."

Combat Log parsing for health was already implemented in Grid2 long time ago.

Goto Statuses > Health&Heals > Health-Current

Select "Instant" for Update Frequency option.

Ah, very cool, thank you!

Sorry for cluttering the issue tracker.