I have a 99 manual with 96K miles, I haven't noticed any slow acceleration. You're always going to accelerate slower at lower RPM's, that's kind of a given. When I "race" I always give it some gas before I let off the clutch, not too much, don't wanna burn up my tires. It's maybe all on your timing letting off the clutch and giving it gas. If you slowly get into gear though, and you're at low RPM's, again, you're not going to speed up fast until you hit higher RPM's.