Very long process

Hi everyone --

I use Toucan everyday to save my work from my office computer to a flash drive, and vice versa.

I love it but I have some problems.

I use it as Mirror, with Retain Attributes / Ignore Read-Only / Ignore Daylight Savings. The sync is very fast, even with folders with a huge amount of files within. However, the process is very slowed down when it arrives to a folder containing only .pdf files (but more than 2,000 files). Even when no files is copied (because nothing has changed since the last update) it takes very long. However, the issue does not seem to be related to the amount of files in the folder because it is very fast when files are .txt (even numerous ones).

Is it a normal behavior of Toucan regarding pdf files (or folders with big amount of files) or is there something I coudl do to speed the process? I can't zip all the files to have only one zip files because I open them everyday from a reference manager software.

Mant thanks for your help