There are pros and cons there. The overhead isn't huge; if you use any ads whatsoever those likely swamp this effect anyhow. And dev time is limited - how muc

There are pros and cons there. The overhead isn't huge; if you use any ads whatsoever those likely swamp this effect anyhow. And dev time is limited - how much time is it worth shaving at best 100ms off for a small and shrinking group of clients? It's cacheable, so it's a not a commonly recurring delay, and it's likely to be a lot smaller on decent networks. (https://tools.keycdn.com/ping https://tools.keycdn.com/ping puts the worst ping as being from tokyo at 84ms; many are sub-ms as you might expect from a cdn). I think it's (potentially) a better tradeoff than making most clients pay for larger bundle sizes even though they don't need it. But well: tradeoffs.