On: Instagram Makes a Smooth Move to Python 3

[adventured]

As one example, PHP 5.x as-is (without caching) isn't a language that scales well at all. It becomes a horrible bottleneck under heavy load.

[thehardsphere → adventured]

Even with caching it's quite poor, especially if you are using frameworks that aren’t written to properly take into account its unique means of execution (which the vast majority do not).