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I have found the problem. I have never looked at python source code before, so some of this may sound funny since I don't speak python lingo. The spikes are caused by the nzo saves in the cache - it appears to grab a lock and all of the download threads pause while the nzo is saved.  On my system, w...

Do you know of a system that transparently caches nntp transfers?

I would like to point out that some of the major news providers appear to be using a near-line storage system for older postings.  Consequently, retrieving these older postings results in much slower transfers than more recent postings.  It does not matter how many simultaneous nntp connections are ...

Memory cache is set to 140MB, I also tried 70MB and it didn't make a significant difference. SSL is not in use. FWIW, here is an example traffic graph - the first two-thirds is for a large 60GB nzb that has been running for 10-15 minutes.  The last third (where it is pretty much flat) is when I bump...

Last question: How is the option "Only get articles for top of the queue" in Config->Switches set? Setting it "off" is more likely to cause such problems. I've tried it both ways, it does not seem to make a significant difference. Can you email me an example of a troublesome NZB...

I regularly use individual nzb files for 20GB-50GB downloads. I use sabnzbd on ubuntu 9.04 (64-bit) and 8.10 (32-bit). I've tried both 0.4.8 and 0.4.11. With these large nzb files sabnzdb likes to periodically chew up cpu and I've noticed that when it has the cpu pegged at 100% actual transfer rate ...