A prototype I'm working on has a feature that fetches thousands of db rows. feature is running 'slow' according to everyone except me and my pc. I can speed up one section slightly by splitting a JSON array into two parts to reduce calls for the 3rd party assets because that's probably the cause.
Still doesn't 'work', says the hapless technoweenies. more troubleshooting.
The cause is Mozilla on a single computer chokes on a 3rd party api, in this case Mapbox.

How do I 'make mapbox run faster' on Mozilla?