[BZ#784306] Very slow performance comparing CSV files - 25x slower than 2009 Windows tool
Submitted by Dan Dascalescu
Link to original bug (#784306)
Description
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":
meld_csv_slow_performance.zip