perf: additional GridLayout optimizations

[SeanKelly369]

Optimised of the gridlayout code for iOS. Use in a production app, with no breaking changes.

[cla-bot]

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[vallemar]

@SeanKelly369 nice! Have you done any performance testing?

[SeanKelly369]

I did for the app for work within a CollectionView table.

[cla-bot]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: Sean Kelly.
This is most likely caused by a git client misconfiguration; please make sure to:

1. check if your git client is configured with an email to sign commits git config --list | grep email
2. If not, set it up using git config --global user.email [email protected]
3. Make sure that the git commit email is configured in your GitHub account settings, see https://github.com/settings/emails

[NathanWalker]

@SeanKelly369 when possible, if you can sign the CLA as mentioned here?