cvs - Deleting files to improve checkout time -

we have version of our project tagged created rtag -- , has large number of files causes checkout exceptionally slow.

a lot of files obsolete, have deleted them , committed change repository. however, checkout time has not improved because files still exist on server , subject processing when new checkout of tag made (but not checked out).

is there way can either disable processing, or permanently delete files, not affect other tags or branches?