Now multisite mode is fully supported. See below. And you can always see full change log of Accelerator for WordPress.
Last changes
Improvements
- Multisite support.
Fixes
- "Compress" encoding is not working correctly.
- AMP pages fail validation.
- Detecting images changes doesn't use WEBP files.
- Not the same site addresses are cached to main site address.
- Old Safari browser JS optimization compatibility.
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More information can be discovered in the original post about New version 2.2 released - Accelerator for WordPress and on the main site.