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With Angular 6 upgrade, our Single Web Page application is very slow in Firefox version 51 32 bit.

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With Angular 6 upgrade, our Single Web Page application is very slow in old Firefox version 51 32 bit. With Angular 4 version , FF 31 was very fast.

With Angular 6 upgrade, our Single Web Page application is very slow in old Firefox version 51 32 bit. With Angular 4 version , FF 31 was very fast.

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Please try with a modern version of Firefox. 51 is not supported and hasn't been for sometime. The current version is 63.0.3

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It also looks like the current version of Angular is 7, not 6. Please update that as well.

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Hi sanjivmt, Angular only claims to support the "latest" release of Firefox (https://angular.io/guide/browser-support). Since Angular 6 was released in May 2018, presumably they tested in Firefox 59 for that cycle, and possibly in the Extended Support Release of Firefox 52.

I don't know how your organization chooses versions to test, but I suggest:

(1) Current developer edition and beta releases (https://www.mozilla.org/firefox/channel/desktop/)

(2) Current stable release (63 - https://www.mozilla.org/firefox/all/)

(3) Current Extended Support Release (ESR) (60 - https://www.mozilla.org/firefox/organizations/all/)

(4) If you support customers on Windows XP or Vista, the last Firefox 52 ESR release (Firefox won't update beyond that release on those platforms)

If your team has a lot of idle time to test other releases, that's interesting for them, but probably not so much for your customers.