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While the default ATS options for this may be optimal under heavy load,
I found using the simpler LRU algorithm much faster and more useful.

The following specifies 512MB 128MB of RAM cache, with objects of unlimited size,
to be managed using LRU. During normal use, RAM utilization will rise and rise
until all 512MB 128MB is used, then the LRU algorithm should kick in.

CONFIG proxy.config.cache.ram_cache.size INT 536870912134217728
CONFIG proxy.config.cache.ram_cache_cutoff INT 0
CONFIG proxy.config.cache.ram_cache.algorithm INT 1
CONFIG proxy.config.cache.ram_cache.use_seen_filter INT 0

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