Slows up garbage collection during the execution of code that allocates a lot of space, in 32-bit LispWorks.
The forms for which you want the garbage collector to behave differently from normal.
The result of executing
is for use with code that allocates a lot of space but is not interactive. It ensures that garbage collection (GC) is carried out less frequently while these forms are being executed. However, each GC may take longer.
is implemented only in 32-bit LispWorks. It is not relevant to the Memory Management API in 64-bit implementations.
LispWorks Reference Manual - 20 Jul 2006