plugins/lazy: add `performance` option

[wrvsrx]

[MattSturgeon]

Thanks for your contribution! This is better handled by moving to a freeform settings option, which is being worked on in #2082.

We could merge this, but then we'd have to add additional "rename" aliases in #2082, which I'm keen to avoid if possible...

cc @my7h3le

[wrvsrx]

Thanks for response. I'll wait for #2082 to be merged.

[wrvsrx]

Given that PR #2082 has been inactive for some time, I'd like to propose that my pull request be prioritized for merging.

[wrvsrx]

ping @MattSturgeon.