# Template rendering slower after updates

**URL:** <https://discourse.aurelia.io/t/template-rendering-slower-after-updates/2794>\
**Category:** Help Requests\
**Created:** [August 1, 2019, 10:26am UTC](https://discourse.aurelia.io/t/template-rendering-slower-after-updates/2794 "2019-08-01T10:26:10Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![elitemike](https://yyz1.discourse-cdn.com/flex027/user_avatar/discourse.aurelia.io/elitemike/32/690_2.png) [@elitemike](https://discourse.aurelia.io/u/elitemike)\
**Post date:** [August 1, 2019, 10:26am UTC](https://discourse.aurelia.io/t/template-rendering-slower-after-updates/2794/1 "2019-08-01T10:26:10Z")

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I’m always behind on updates due to working offline. Recently I updated my project to use all the latest packages. I’ve noticed that rendering, especially where I’m doing a repeaters is visually slower.

Where there any performance hits noted with aurelia-templating or binding? Any things that I simply should not be doing anymore.

I can’t share code…

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**Author:** ![bigopon](https://yyz1.discourse-cdn.com/flex027/user_avatar/discourse.aurelia.io/bigopon/32/18_2.png) [@bigopon](https://discourse.aurelia.io/u/bigopon)\
**Post date:** [August 1, 2019, 10:38am UTC](https://discourse.aurelia.io/t/template-rendering-slower-after-updates/2794/2 "2019-08-01T10:38:16Z")

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@elitemike can you share what version you upgrade from/to?  
And also browser version?

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**Author:** ![elitemike](https://yyz1.discourse-cdn.com/flex027/user_avatar/discourse.aurelia.io/elitemike/32/690_2.png) [@elitemike](https://discourse.aurelia.io/u/elitemike)\
**Post date:** [August 2, 2019, 10:50am UTC](https://discourse.aurelia.io/t/template-rendering-slower-after-updates/2794/3 "2019-08-02T10:50:48Z")

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We are running the latest chrome and Firefox. Both browsers exhibit the same behavior  
My package.json prior had  
aurelia-bootstrap at ^ 2.3.0  
aurelia-polyfills at ^1.3.0  
aurelia-templating at ^1.10.1

I’m actually not sure what version was being pulled in. When I updated our last npm offline repo I copied all the latest from a clean cli webpack install

I moved to how the latest cli generated webpack project starts so i have  
aurelia-bootstrap at ^2.3.2  
and the other 2 items are removed

my running version of templating is 1.10.2  
binding is 2.3.1  
bootstrap is 2.3.3

I did notice that the latest cli webpack does things differently with the polyfill in main.ts. I am confused by this out of box configuration.

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**Author:** ![elitemike](https://yyz1.discourse-cdn.com/flex027/user_avatar/discourse.aurelia.io/elitemike/32/690_2.png) [@elitemike](https://discourse.aurelia.io/u/elitemike)\
**Post date:** [August 2, 2019, 10:59am UTC](https://discourse.aurelia.io/t/template-rendering-slower-after-updates/2794/4 "2019-08-02T10:59:16Z")

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It may be the lack of bluebird… Early testing indicates it is.

If this is the case, I question the teams decision to not use bluebird for the oob. My site literally went to crap. I have a form builder that would be nearly instantly rendered, you’d get to watch the elements come in one by one.

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**Author:** ![bigopon](https://yyz1.discourse-cdn.com/flex027/user_avatar/discourse.aurelia.io/bigopon/32/18_2.png) [@bigopon](https://discourse.aurelia.io/u/bigopon)\
**Post date:** [August 2, 2019, 10:24pm UTC](https://discourse.aurelia.io/t/template-rendering-slower-after-updates/2794/5 "2019-08-02T22:24:35Z")

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Make sure your compiled code is in loose mode as well. Spec compliant compiled code is perf killer

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<div class="post-metadata">

**Author:** ![elitemike](https://yyz1.discourse-cdn.com/flex027/user_avatar/discourse.aurelia.io/elitemike/32/690_2.png) [@elitemike](https://discourse.aurelia.io/u/elitemike)\
**Post date:** [August 5, 2019, 11:59am UTC](https://discourse.aurelia.io/t/template-rendering-slower-after-updates/2794/6 "2019-08-05T11:59:37Z")

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I’m actually not sure what you mean by this. Is this a webpack setting or TS?

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**Author:** ![bigopon](https://yyz1.discourse-cdn.com/flex027/user_avatar/discourse.aurelia.io/bigopon/32/18_2.png) [@bigopon](https://discourse.aurelia.io/u/bigopon)\
**Post date:** [August 6, 2019, 8:08am UTC](https://discourse.aurelia.io/t/template-rendering-slower-after-updates/2794/7 "2019-08-06T08:08:45Z")

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Well i thought you might be using babel, and compiling your code to spec compilant