[Nexus 7 Original Development] RealPariah:
hhhmmm, dunno why you wouldn't have grabbed 2.54 if not the newest 2.99 B 5.1, what do you mean by laggy? Did you follow directions in that you specifically wiped /system and /data and cache and dalvick cache BEFORE flashing ROM [Factory reset only wipes /data and cache not /system]? I would do a wipe of /system /data and both cache and dalvick cache specifically yourself before flashing ROM [in CWM visit Mounts and Storage menu for wiping everything except Dalvick cache that is in advanced]. The above is if using CWM TWRP Recovery has same options just implemented differently and in slightly different places [though labeled as such]

Otherwise you could install Supercharger V6 and don't worry about patching services.jar if you don't want to go that far just run the script choose exit when prompted to auto patch [wont work in JB don't use it] and specifically apply menu option 22 Nitro Lag Nullify after running intial setup [it walks you through pretty much everything]. I love Supercharger V6 and have used it on tons of devices since it released way back when Android V 2 was the hot stuff [LoL, not really that long ago, but feels like it in the tech world], and it really does make a difference. Just download Script Manager [SManager] from market and use that to open the scripts when you download them.

SuperCharger V6 Thread

You will also see other helpful scripts like a nice memory flusher, database cleaner [just the crap in them it doesn't affect the data they contain], zip alignment [aka wheel alignment], Super Clean [wipes cache and dalvick cache and restarts device for you], and last but definitely not least is Fix Emissions [a superb and super fast fix permissions script :) ].

That should help, let me know and please try to provide more detail as to what is laggy if that doesn't nail it.

Last thing, don't forget to check on something like voltage control or similar to change SDCard [internal storage] data scheduler from CFQ to deadline. I so wish we had BFQ included but hey custom kernels are in the works :)

---------- Post added at 09:27 AM ---------- Previous post was at 09:11 AM ----------

I covered this not too long ago you can visit BBQLogs and see the CM10 changes which is pretty much the majority of this ROM and then you could visit the GitHub Project for paranoid and see the changes as they are proposed, detailed and done on the code itself. Please remember to search a thread before asking. Not trying to jump on you just trying to help keep repeat questions and clutter to a minimum.

Paranoid GitHub Project For Grouper [Nexus 7]: Github-Paranoid-Asus.Grouper

and BBQ Logs for CM10 [Also a free app on market called BBQ Logs for easy reading on devices]: BBQ Logs - CM10 Nightly Changelog

[Should hopefully load Nexus 7 info right up front, if not once loaded page has bar across the top of manufacturer names click Google and click Nexus 7 in dropdown and then choose nightly release you want to view changes for on left hand menu after choosing device].

and yeah I am sure they will be updating the changes, and further updatind directions and what not, but as stated the Developers are working hard on 4.2 as they need to get all of the Paranoid Goodness merged in and fully functional so for now lets let them work their magic and do our best with what we have.