Average object size, used to estimate number of objects your
	cache can hold.  The default is 13 KB.

	This is used to pre-seed the cache index memory allocation to
	reduce expensive reallocate operations while handling clients
	traffic. Too-large values may result in memory allocation during
	peak traffic, too-small values will result in wasted memory.

	Check the cache manager 'info' report metrics for the real
	object sizes seen by your Squid before tuning this.