Even more efficient would be to write a custom hash loading routine in XS that a) extracts the refaddr automatically, and b) uses the binary representation of the address as the key for the hash lookup/storage. Currently when you use $hash{0+$self}=$foo you are doing itoa() on the address, then using the resulting string for the hash key. If the addresses binary representation was used as the key they keys would be fixed length, and would not require the itoa() step, and would be much faster. I imagine this would about 4-8 lines of XS code and would be drammatically faster than using $hash{0+$self}. Ie I can imagine an API like:
ref_key_store(%hash,$ref,$value);
my $val=ref_key_fetch(%hash,$ref);
---
$world=~s/war/peace/g
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