Cached session keys are stored in nonpaged pool memory. Increasing the value of EFSKCACHEPERIOD will result in higher usage of nonpaged pool memory. This increased nonpaged pool usage might cause problems for some machines, especially machines that are trusted for delegation for remote encryption.
Value: 5 secs default value; 2 sec min, 20 sec max
Adjusting the user mode cache validation time upwards will improve the performance of systems that use EFS operations frequently. When EFS operations are in use, processing time is needed for the system to obtain and validate the certificates and keys. This will significantly slow system performance if the user mode cache validation time is set too low. The higher the user mode cache validation setting, the less often the system validates; the lower the setting, the more often the system validates. If EFS security is a priority in your system, then you will want appropriate EFS credentials to be validated more frequently. For maximum security, the lowest setting will provide the most frequent validation.
Key: Software\Microsoft\Windows NT\CurrentVersion\EFS
Value: 3600 secs default value; 60 min, 86400 (1 day) max '