You might want to make some load modules resident in a link pack area in order to minimize the search path length when High Level Assembler is run.

All assembler load modules are reentrant and eligible for placement in the link pack area (LPA) and the modifiable link pack area (MLPA). The LPA and the MLPA are areas of storage that are shared by all users. By placing modules in these areas, you reduce the amount of storage needed in the user region.