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The default setting for ATS is unfortunately quite low. For some reason this caused a repeatable,
large delay when loading Bing Image Search results. The following setting removes most of the delays
and seems to speed up the cache overall a bit.

From Leif H: "The text around proxy.config.cache.mutex_retry_delay is confusing. Setting this higher would increase latency, not reduce it, at the expense of possibly consuming more CPU. If you experience something different, I think it’d be worthwhile to file a Jira."

I'm sure I have experienced higher latency, but also somehow avoided a disk contention problem.

CONFIG proxy.config.cache.mutex_retry_delay INT 25

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