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<p dir="auto">I have had this situation for many YEARS, long before I got MailMate. <br>
The overall symptom is that backups take <em>many hours</em>, with sudden, inexplicable stalls. I say </p>
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<div style="white-space:normal"><blockquote style="border-left:2px solid #5855D5; color:#5855D5; margin:0 0 5px; padding-left:5px"><p dir="auto">"inexplicable" because Activity Monitor shows essentially no CPU, network, or disk activity -- but the backup just *stops*.</p>
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<p dir="auto">The problem is worse, the more Time Machine needs to back up. And for reasons I have never figured out, even a routine backup on TM (of a few hours of material) can have 5GB of files to go through. As a result, I can get into a situation where TM is completely unable to get up to date.</p>
<p dir="auto">So I don’t know a solution, but don’t be too sure that it is really due to MM. If anyone finds a solution, please drop me a line!<br>
One thing that helps is to switch from WiFi to a hard ethernet connection. For some reason, TM is considerably faster that way.</p>
<p dir="auto">Roger Bohn, UC San Diego<br>
<a href="mailto:Rbohn@ucsd.edu">Rbohn@ucsd.edu</a></p>
<p dir="auto">On 10 Dec 2017, at 18:14, Steven M. Bellovin wrote:</p>
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<div style="white-space:normal"><blockquote style="border-left:2px solid #5855D5; color:#5855D5; margin:0 0 5px; padding-left:5px"><p dir="auto">Seems like an improbable subject line--but is anyone else who uses MailMate on High Sierra/APFS suddenly having serious Time Machine performance issues? I am, on two different laptops. An iMac, which has a hard drive and hence HFS+, is not having any trouble.<br>
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The overall symptom is that backups take *many hours*, with sudden, inexplicable stalls. I say "inexplicable" because Activity Monitor shows essentially no CPU, network, or disk activity -- but the backup just *stops*. I normally don't run MailMate on one of the laptops; its backups complete in a rational amount of time. When I do, it sees the same stalls. In fact, I'm running MailMate on it right now so that I can see what happens on my primary laptop when I exit MailMate. Sure enough, that machine is now behaving.<br>
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My suspicion is that the problem has to do with very large directories on APFS file systems, but I don't know that for sure. I have some very large mailboxes, though, and these are of course active when MailMate is running. And of course, that doesn't explain why I don't see any system activity.<br>
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Is anyone else seeing this? Does anyone have any work-arounds, other than "don't have such large mailboxes" or "don't run APFS"? I do have a new laptop on order; I'm seriously tempted to reformat it as HFS+ before I start using it.<br>
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--Steve Bellovin, <a href="https://www.cs.columbia.edu/~smb">https://www.cs.columbia.edu/~smb</a><br>
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