I'm using the synchronizer tool to backup my personal files on an sftp server. However, it has become unusable because krusader starts reserving enormous amounts of memory (about a GB, way more than the delta of files that needs to be transferred, and also way more than the size one needs to store just the directory information).

Reproducible: Always

Steps to Reproduce:
1. Open a new SFTP connection to backup server
2. Synchronize directories with lots of files (my example: pidgin logs)
Actual Results:  
While comparing the folders, memory usage of krusader grows to about a GB. It would grow even more if I didn't run out of memory at that point, since the comparison is not even half way done.

Expected Results:  
Do the comparison without bloating up.

It might be possible that most of the file names of the files I want to synchronise are illegal. They contain characters like "+". Maybe the synchroniser is storing all the error messages somewhere internally?
If I just copy the files to the SFTP folder, it works normally. However, files with characters like "+" don't show up on the server, which I blame to the server.
If I mount the SFTP folder via sshfs, synchronizer can synchronise the folders without bloating up. (And it doesn't ignore the files with "+", but that might be a separate bug.)