30.05 19:07:00 [Server] Server thread/WARN [FML]: Dynamic Trees loaded a new chunk [-22, -8] in dimension 0 (overworld) while populating chunk [-21, -9], causing cascading worldgen lag.
30.05 19:07:00 [Server] Server thread/WARN [FML]: Please report this to the mod's issue tracker. This log can be disabled in the Forge config.

What other info can I give?

I stamp these out as I encounter them. Sadly this doesn't produce a crash and thus no crash log. Without a crash log I can't tell where the error is. You can however tell me what kind of biome this occurred in. That might help me to reproduce it.

Forest biome

idk if these logs will be helpful or not
debug (2).txt
latest (2).txt

Thanks. Also. You're using the most up to date version of Dynamic Trees? 0.7.7e is the latest.
If you're using Dynamic Trees BoP compat then make sure you're up to date with that too.

Edit: Looks like you're using the latest according to your debug logs.

Unfortunately this issue is non-productive