That is not normal behaviour for this rom, hell, if it was no one would use it. Something else is going wrong if you are lagging this much. My wife still has this rom on her phone, as do two of my mates, and the phones are still as quick as when the rom was first installed. I know that none of the Huawei based roms are perfect but this rom does not normally perform in the way you describe, or at least not on any of the phones I've used. I'd try a fresh install or a different rom but I certainly couldn't put up with a phone lagging as much as you describe, it would have been bounced off something by now.
Yeah, believe me I've been tempted to throw it at something and have been cursing it and telling my friends that smartphones, at least cheap ones, are a complete pain in the butt (I assume the more expensive, multi-core ones are a lot better).
I figured it wouldn't be so popular if it was always like this. I did reinstall quite recently and made sure to only install the apps I really needed so that I could test it. It's generally a lot better if I reboot it but of course you don't want to have to keep doing that.
Anyway, I installed RAM Manager Free and Cache Cleaner yesterday so maybe they'll help. If not, I guess I'll have to try another reinstall and start again.