[BZ#784306] Very slow performance comparing CSV files - 25x slower than 2009 Windows tool
Submitted by Dan Dascalescu
Created attachment 354644 Meld doesn't manage to slow inline differences within several minutes
I've migrated from Windows to Linux and one of the last tools that I need a good replacement for is CompareIt (http://www.grigsoft.com/wincmp3.htm). It's a really good old tool that's wicked fast as visually comparing files.
Attached is a stripped down test case of two CSV files that Meld takes ~3 seconds to determine are different before prompting to Keep highlighting. Highlighting inline differences takes more than 5 minutes (the tool was unusable beyond this point, so I quit it), while CPU utilization spikes to 100% of one core and Meld's input thread is slowed down to a crawl.
I wrote "25x" in the subject line based on the full test case, which takes Meld ~25 seconds to prompt to Keep highlighting, while CompareIt displays inline differences in one second.
Attachment 354644, "Meld doesn't manage to slow inline differences within several minutes":