Version BlockDrops-1.9.4-1.0.3 hangs for about a minute of Phase 3 when launching Minecraft and loading it up. No crash, just thought this might be something too look at.

That's normal. I calculate the drops by simulating a block mining. The more blocks (e.g. Chisel) you have the more it will take. You could reduce the time by decreasing the iteration number in the config file.

But does it need to do it every time? Unless the mods change it shouldn't have to do it again.

Mystcraft has a similar kind of profiling but it only does it once, unless you add new mods or update mods.

Thanks.