[robryk]

Why? This is one of the most cacheable resources. Also, it's displayed reasonably often, so I'd expect it to be rarely evicted from the device-local cache.

[mehta]

Even if it isn't evicted very often, the first time it is loaded, it will be ~3 times faster, it will take up less storage thus better for others and (probably) easier to render.

[sondr3]

And on the scale Google operates on it'll save quite a bit for them as well to serve it.

[kllrnohj]

First impressions matter, and caches do not help with that in the slightest.