Identify laggy mods in custom modpacks

[ajthemacboy]

Hello, I'm making a custom modpack for a small server, something I've done many times before, and always with a problem.

 

In this pack, I tried merging ResonantRise and Infinity together. Both packs are stable by themselves, with no lag on my machine. In the merged pack, though, there's a ton of lag.

 

I know this is not simply an issue of 'too many mods,' because I can run other massive modpacks fine.

 

What I need to do is identify the laggy mods. I've tried using Sampler by Player, and OPIS, but neither seems to lend any results.

 

If I understand correctly, there are just some mods that don't play well together. All I need to do is identify them.

 

What tools can I use to do so?

[ajthemacboy]

I figured out RedPower was causing some lag, removed it and things got BETTER, but still laggier than it should be.

 

I would quote specs, but just take my word for it, they're good enough to handle this even if Minecraft is terribly optimized.

[ajthemacboy]

Maybe I should re-word my question: How do pack creators like FTB optimize their packs?

[loordgek]

maybe the ftb forum can help you