I have noticed that some WUs complete very quickly - below 1 minute. They complete without error. Because you send up to 3 WUs only, my machines sometimes switches to backup project - I see this in WUProp stats. Could you increase number of WUs in progress, so my machines could have more work from yafu waiting?

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No, it it some kind of counter measures against cheaters to hand out only 3 workunits.

There are now enough workunits available.

The last 2 days the work generator had some problems because of the factordb.com where I get the new numbers from. This was the reason that you didn't got enough work.

yoyo

I found this before 24th Oct, on this day I switched for a week for PrimeGrid challenge.
Here are few examples for very short yafu-32 WUs. If 2 or 3 of such WUs will appear in the row, even very short scheduler retry period (15 secs) will not help and Boinc Client will switch to backup project.

https://yafu.myfirewall.org/yafu/workunit.php?wuid=3007026 - 2.17 sec
https://yafu.myfirewall.org/yafu/workunit.php?wuid=3002879 - 6.18 sec
https://yafu.myfirewall.org/yafu/workunit.php?wuid=2995509 - 2.13 sec
https://yafu.myfirewall.org/yafu/workunit.php?wuid=2993787 - 5.11 sec

BTW, if you are afraid of cheaters, please reconfigure server to double-check all WUs (set minimum quorum to 2). This should be enough to get rid of them. Now with badges you should see more people willing to crunch here, so it should compensate slowdown introduced by doublechecking all results.

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You can re-ask the server for new WUs already after 7 secs.

I found this before 24th Oct, on this day I switched for a week for PrimeGrid challenge.
Here are few examples for very short yafu-32 WUs. If 2 or 3 of such WUs will appear in the row, even very short scheduler retry period (15 secs) will not help and Boinc Client will switch to backup project.

https://yafu.myfirewall.org/yafu/workunit.php?wuid=3007026 - 2.17 sec
https://yafu.myfirewall.org/yafu/workunit.php?wuid=3002879 - 6.18 sec
https://yafu.myfirewall.org/yafu/workunit.php?wuid=2995509 - 2.13 sec
https://yafu.myfirewall.org/yafu/workunit.php?wuid=2993787 - 5.11 sec

BTW, if you are afraid of cheaters, please reconfigure server to double-check all WUs (set minimum quorum to 2). This should be enough to get rid of them. Now with badges you should see more people willing to crunch here, so it should compensate slowdown introduced by doublechecking all results.

I checked two hosts and after manual refresh I saw 17 secs as a scheduler delay. So it still works similarly as before.

And I hope that you are not asking me to monitor WUs 24/7 to manually trigger update faster, this is impossible.

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On serve side the delay is set since long time to 7 seconds:

...
    <min_sendwork_interval>
      7
    </min_sendwork_interval>
...