There seems to be precious little further info on that var, though google did turn up this

This value by default is 65536 which corresponds to a 512kB temporary cache. Set this to a higher value to trade memory for speed when matching large alternations.

But so far, setting it higher (2**17) or lower (256) doesn't seem to change the perform or the break point one iota. Maybe demerphq will happen by and give us the skinny on it.

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In reply to Re^2: 5.10.0 regex slowdown by BrowserUk
in thread 5.10.0 regex slowdown by BrowserUk

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