Grip Cache

The Grip Cache is a secondary Virtual File Cache that ZipStream uses to 
optimise performance. 

The size selection is given in MBytes. 

Basically, a compressed file that has the Grip cache option will be 
retained in the Virtual File Cache memory as uncompressed data for a 
period of time after its last access. 

The benefit of this is that any subsequent accesses within the Grip time 
period, will avoid the decompression delay. 

The value selected is only a hint to ZipStream as ZipStream will 
internally adjust this value depending on the system configuration. 

Currently the default Grip period is 1 (one) minute. 

Note:  A reboot is required for this option change to take effect.