Disable Large System Cache

SSD Optimizing Guide - Standard Optimizations - Disable Large System Cache


Large System Cache allows windows to use more RAM for cache thus needing to page to the SSD less often. For older machines this caused issues when RAM was at a premium but for machines with 4GB+ RAM you will only notice performance improvements.



Windows file sharing programs generally perform better when information is read from the system cache instead of read repeatedly from the hard disk. When the system cache is used appropriately, performance improves. System cache mode controls the partitioning between the memory that Microsoft Windows allocates to file caching and the memory that Windows allocates to applications. System cache resources are partitioned during startup and do not change. System cache mode is designed to improve the performance of Windows by increasing the system’s file cache size.



You should not use Large System Cache if your machine has too little RAM.

EG. Less that 2GB in Windows XP with APG/PCIe Graphics
When you enable System cache mode on a computer that uses Unified Memory Architecture (UMA)-based video hardware or an Accelerated Graphics Port (AGP), you may experience a severe and random decrease in performance. For example, this decrease in performance can include very slow system performance, stop errors, an inability to start the computer, devices or applications that do not load, and system instability. 

Note: If the computer does not start, you can select the Last Known Good Configuration option when you start the computer. This will reset the LargeSystemCache registry entry setting back to its default setting.