Improve PRAO2 performance

[pet-mit]

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• [ ] The commit message follows our guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
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Does this PR already have an issue describing the problem?

Fixes #1061

What kind of change does this PR introduce?

What is the current behavior?

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Does this PR introduce a breaking change or deprecate an API?

• [ ] Yes
• [ ] No

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Other information:

[pet-mit]

Tested on cucumber tests but the performance improvement does not seem huge. To do if validated : add tests + see if new methods can be used elsewhere

[phiedw]

I'll have to do check properly but I think the copy is now much much faster, so this is probably why the gains were small.