Gets or sets the most bytes of a remote file a document keeps cached; the least recently used blocks are dropped beyond it and fetched again when needed. Default 64 MiB.
public long RangeCacheLimit { get; set; }
Spec #33, viewer capability 5. Parsed objects are kept by the document whatever this limit; the cache holds the bytes stream data is read from. Where SynchronousRangeFetch is off, a page's objects must fit in the cache between its PrefetchAsync(CancellationToken) and its reading.