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i once had this issue (slowness, lagging), and i did the following, now the device is zippier and faster than ever:
Decide to do a complete make-over (reflashing the ROM)
0. backup your apps & files, copy SD to harddrive, in order not to lose data
1. reboot into recovery screen, WIPE
2. flash the ROM, reboot, flash the theme you like (and that fits to the ROM), reboot, flash AdvancedLauncher 2.1 if you like (i use it for its certain functions), reboot
3. if you can live without 3D-games, you can use the 10MB RAM-hack; in terminal emulator flash RAM-Hack image (boot.img) (IMPORTANT: it needs to be the boot image that fits to your ROM!
3. reboot
4. reboot recovery; in console or adb shell: fix_permissions
5. reboot
6. install "user.conf Creator" app, READ THE INSTRUCTIONS (inside the app), open it and:
--> enable permission_fix
--> enable compcache (i use 64MB)
--> enable ccbackinswap (i use swappiness 50)
--> enable linux-swap (my linux-swap partition is 128MB; i use swappiness 50)
--> backup files
--> push files
--> reboot
(i experimented with different "swappiness" values, 50 worked out best for me, but it may be different for you. at swappiness 80 loading of apps is really fast, but scrolling and going back to home screen is really slow. 50 seems a good middle value.)
7. done
this can easily take up to 1 hour. After applying user.conf it may take a while on first reboot until the phone is fully loaded, but it's well worth the effort.
i also use SetCPU, to set CPU clock to 528/528 when charging, 384/245 when sleeping, and 128/128 when power <10%
good luck
Phone: HTC One X
Tablet: Galaxy Tab 10.1 (GT-P7500 / p4)
Legacy devices
Tablet: Galaxy Tab
Phone: Nexus One
Phone: G1
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