The number of arguments of a compound term may not exceed 255.
The number of atoms created may not exceed 1048575 (33554431) on 32-bit (64-bit) architectures.
Saved-states and `.po' files are not portable between 32-bit and 64-bit architectures.
Indexing on large integers or floats is coarse, i.e. there is
essentially no indexing between different large integers or floats. This
can have a huge negative impact on performance, e.g. when
using hash codes or some such to represent a hash-table as clauses. The
hash predicates in library(terms) avoid this, by default, but it
has been known to cause hard to track down performance problems when the
number is created by some other means.