Web app takes long to load with iOS 9 and compression

Hi -


We're running a .NET MVC Singe Page Application that combines and compresses all CSS/JS files when deploying.


Compressions are done by Microsoft.Ajax.Utilities.Minifier.

Combination is done "manually" by writing one big file.


Whenever we reload the page on an iOS 9 device loading takes a long time (about 5-10 seconds) - but then works as expected.


When I switch of the combination and compression it takes about half a second to load -

as it does on any other browser with compression...


CSS file size is ~70kb, JS file size is ~ 220kb


Is this a known issue with Safari on iOS 9?

Any known workarounds?


Cheers,

Jay