It supports both local diskcaching as well as caching in memory.
它既支持本地磁盘缓存，也支持内存中的缓存。
2
Diskcaching reduces the in-memory footprint while creating a PDF, but is slower.
虽然在创建P DF时，磁盘缓存减少了内存占用，但是速度变得更慢了。
3
For instance, you can allocate memory for caching, which reduces disk access, or access resources over the network rather than reading off the local disk.