Is there a way to keep GetCapabilities response time short and consistent?

Response time for WMS GetCapabilites request differs based on the time
passed between two sequential GetCapabilites requests made to the server.
For example, if the second request is issued within ~20 minutes of the
first getCapabilites request than response time for the second request is
usually around 300-600 ms.

When the time between first and second request increases to 20 min. to 2
hours than GetCapabilities response time increases to 12-16 Seconds. If the
time between first and second request is more than few hours than it takes
2 to 5 Minutes to get a GetCapabilities response.I am testing with
GeoServer Version 2.16.2, have approximately 150 layers, using a Limited
SRS list (with 3 SRS), all vector data, mostly coming form PostGreSQL
database and some local shape files. Is there a fix for this problem?
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