Node API (3413) becomes unresponsive while compressing txhashset_zip

[bladedoyle]

Describe the bug Node stops responding to foreign api requests while doing a grin_util::zip - compress on hain_data/txhashset_zip

To Reproduce Run a node with default settings In a loop query the foreign api (get chain height for example) in a loop, every 5 seconds, reporting connection errors. Match up the client connection timeouts with the node logs for compressing txhashset_zip

Its unacceptable for the node to become unresponsive.