PCoIP client-side image caching stores image content on the client to avoid retransmitting data. This feature reduces bandwidth use.
The PCoIP image cache captures spatial and temporal redundancy. For example, when you scroll through a PDF document, new content appears from the bottom of the window and the oldest content disappears from the top of the window. The remaining content is constant and moves upward. The PCoIP image cache can detect this spatial and temporal redundancy.
During scrolling, because the display information sent to the client is primarily a sequence of cache indexes, using the image cache saves a significant amount of bandwidth. This efficient scrolling has benefits both on the LAN and over the WAN.
- On the LAN, where the bandwidth is relatively unconstrained, using client-side image caching delivers significant bandwidth savings.
- Over the WAN, to stay within the available bandwidth constraints, scrolling performance is degraded without client-side caching. Over the WAN, client-side caching saves bandwidth and ensures a smooth, highly responsive scrolling experience.
With client-side caching, the client stores portions of the display that were previously transmitted. The cache size is one-half the available RAM. If that amount of RAM is less than 50 MB, the cache size is 50 MB.