Read this in the showcase forum and you will feel safe using WIX.
https://www.wix.com/code/home/forum/show-off-your-work/speed-testing-a-wix-code-site
To see this working, head to your live site.
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Wishlist Page is the new official platform for requesting new features. You can vote, comment, and track the status of the requested features (requests from this page will be migrated to the new Wishlist soon).