Using the latest version of Spire.PDF, free and trial, in test, when reading several files in loop, executing Dipose(), the memory is not freed, it just increases.
This is a problem. When analyzing the memory, I noticed that an internal list of Spire.PDF just grows and never frees memory.
UPDATE
Using version FreeSpire.Pdf, 6.10.6, in massive tests, it increased 1mb in memory after 18 minutes. It looks better than the current version.