I encountered a problem with the function Read.
Namely, if I have a file in which a BIG permutation group, as well as
its subgroup is stored in the format I give below, GAP starts
MakeStabChain, which in my case is unnecessary and takes forever to
complete (I discovered this by pressing ^C after waiting for a while for
the prompt to appear.)
The format is as follows:
g:=Group(<permutations>);; g.name:="g";; h:=Subgroup(g,[<permutations>]);;
This does NOT happen if the group isn't too big (in my case g is of degree
about 1500 and the number of generators is about 15 for both g and h).
(I can supply the file with it upon request.)
This happens equally for versions 3.3 and 3.4.
(There is a certain way around it, I can keep generators as single
permutations and recreate the group after entering them.)