AVIF decodes well and is likely to improve in speed. Various performance improvements have been achieved in recent releases of decoders. Hardware support for AV1 is starting to appear. Still, we are confident that dedicated hardware is more likely to be catered to video decoding than images.
How good is AVIF decoding speed?
Primary sources1. AVIF - The Full Guide and FAQ2. AVIF AOMedia Specification3. AVIF Wikipedia4. Jake Archibald Article5. AVIF Netflix article