This issue might have been raised before, so please bear
with me if so.
In a project I work with there are some very large classes
(around 5000 lines long) which are generated as a result
of compiling MIB files to java.
IDEA is very very slow operating on these classes, although all they have in them are simple hashtable
initialisation. Cut/Paste operation take in the order
of 30 secs to complete.
These, admitadly are exceptional cases, however the performance degradation is worrying.