I think you may have provided me a clue to some weirdness I've been experiencing. After updating Reika's mods from v11 to v12 with no other changes I'd been experiencing lag in block and redstone responsiveness, however my FPS has been smoother than normal. I also don't see the lagging issues on a new world. I'd suspect there is some interaction between one of the mods and these or maybe I've just hit the limit on the number of mods I can use in a local radius. Disabling some of the server heavy ones may help alleviate the problem and let me record again.
On to the next Gold City episode. I've finally decided to get control over my item situation. Mods to the rescue: Storage Drawers and Thermal Dynamics.
Enjoy!
If you're actively using a relative bunch of Reika's tech mod machines/transmission, you could be choking on CPU a bit. I'm not familiar with the more nitty-gritty of how ChromatiCraft affects performance, except for the crystal network and other late/end-game stuff, but before you start using lumen repeaters it shouldn't do much at all.
That being said, something I eventually learned in minecraft (The cause is more obvious modded because more TE's and other (lesser) resource hogs, but it happens in vanilla too) if you want to be performance friendly, outposts are a VERY good idea. Thematic/specialized ones generally. The less stuff you have to load at once, the better. Also try for efficient builds once you have the capability. Don't leave redstone running when you don't have to, shutoffs are your friend for machines of all types, avoid living entities whenever possible, item entities are also bad, so are tile entities (notice a theme? Yeah, MC's entity handling is terrifically horrible for a lot of really silly reasons). Oh and by efficient I mean SERVER efficient. The less actual computational work a thing has to do to function, the better. Buildcraft pipes? Much worse than ExU pipes for example, or Thermal Dynamics Ducts, or well pretty much anything except AE (AE puts a crapton of overhead on how they do things because of the versatility inherent in the system. They're better NOW than they used to be... but still ouch.). Steve's Factory Manager is your friend for a lot of things. So are "dumb" systems that just do stuff periodically instead of having active detection.
I could probably walk through your world and point out all kinds of things you might be able to do to help with performance (not caught up to present day... there really needs to be more hours in a day, or I need to be able to get content into my head while still getting productive work done IRL).
You can also add mods to help a bit by making the base game quit being so bloody derp about its engine (seriously, the thing needs a proper overhaul as evinced by the 1.9 particle change, and talk to any large server operator, or dev that's struggled with performance optimization in MC). AI Improvements (http://minecraft.curseforge.com/projects/ai-improvements), BetterFPS (http://minecraft.curseforge.com/projects/betterfps), COFHTweaks (http://minecraft.curseforge.com/projects/cofhtweaks), Squidless (http://minecraft.curseforge.com/projects/squidless), or Fastcraft Note, don't use with COFHTweaks (http://forum.industrial-craft.net/index.php?page=Thread&threadID=10820) are also good options for performance enhancement. EVOC used to be awesome, but Prof Mobius didn't update it.