Delay when saving flags

[Michael Fischer v. Mollard]

Some users are complaining about random delays in communication with our 
cyrus v2.1.13 server. In the telemetry logs there are lines like

<11:06:20<A00119 STORE 1806 +FLAGS (\Deleted)
>11:06:26>* 1806 FETCH (FLAGS (\Recent \Deleted \Seen))

(timestamps changed to a better readable format). This seems to be too 
long, what may cause this delay and what can I do about it?

Regards
MFvM

-- 
Michael Fischer v. Mollard, network administration
Heise Zeitschriften Verlag GmbH & Co KG
Helstorfer Straße 7
D-30625 Hannover
Tel: +49 511 5352 477; Email: Michael.Fischer.von.Mollard at heise.de