Small threadsafevariable change == decent request time speedup

[laundmo]

Hi Massimo (mainly)

3 weeks ago I submitted a PR for the threadsafevariable utility used in py4web which speeds up requests by quite a lot due to a faster Threadsafevariable.restore() method.

https://github.com/web2py/threadsafevariable/pull/2

You didn't seem to have noticed this, so I wanted to ping you here.

It's a pretty simple change - storing in a dict variable instead of the objects __dict__ and copying the whole restore image - but it results in cutting the time per request it takes from 7% per request to 0.23% in my tests.

Cheers

[Massimo]

Sorry overlooked this. Been travelling a lot. Merged now and upgrading py4web. Thanks for the help