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[Q1-Q2 2018] very slow startup time of CSHTML5

Posted: Wed Oct 19, 2016 9:50 am
by Sesztak
Dear JS-Support,

We hade a huge performance problem with startup time of our CSHTML5 app:

We would like to know that it is a bug or an expected "performance" ?

Let's see the numbers -see the attched CSHTML5 Timer Fired JSIL Browser.js 15.41sec.jpg:
-The whole test page cold startup time takes approx. 19 sec.
-the main performance bottle neck is a Scripting time: 18.6 sec.
-within that it takes 15.41 sec the Timer Fired , JSIL.Browser.js !!

So, it some part what we do not understand:
-the number of DOM elements is high (based on Simulator): 2343 !! (which is strange as the whole XAML is no more than 700 (short) lines !): how it is possible ?
-is this normal, that JSIL.Browser.js takes more than 15 secundums with scripting ?
-what is the exact meaning of JSIL.Browser.js ?

Is there any way : tips or tricks to speed up the start up time of a relative simple CSHTML5 app ?
(apart to set ScrollViewer to Visible as we did: I mean we never us Auto)

Is there any better performance profiler tool (better than Chrome build in by F12) what you can advise to pinpoint the bottleneck in more details ?

Really waiting for your kind help,
Thanks in advance,
Best regards,


Re: very slow startup time of CSHTML5

Posted: Thu Oct 20, 2016 2:06 am
by JS-Support @Userware
Dear Péter,

- We are working on performance improvement right now. Please expect significant performance gains in the coming weeks.

- JSIL Browser.js: I think it is misleading: even though it appears to come from this file, the slowness is likely elsewhere.

- To make it easier to pinpoint the cause of the slowness, we are adding to the upcoming Beta 10.2 some new performance profiling tools to measure how much time is spent in each portion of the code by manually adding performance counters between the lines. Please stay tuned in the coming days for details.


Re: very slow startup time of CSHTML5

Posted: Thu Oct 20, 2016 2:13 am
by Sesztak
Thanks for your kind reply : Great News !
really looking forward .. !!


Re: very slow startup time of CSHTML5

Posted: Thu Nov 02, 2017 2:54 am
by elina
Hi, I have 12.4 v, but the speed of startup time is still too slow. I tested performance with "Hello World" kind of project and the result is too slow. Here you can see that "Hello World" app takes 7s to load and the size is huge as well (13MB).
speed.png (3.46 KiB) Viewed 1626 times

Is there any way to speed up loading time (web)?

Re: very slow startup time of CSHTML5

Posted: Thu Nov 02, 2017 5:08 am
by JS-Support @Userware

Please expect major performance improvements in early 2018. We are working hard on it and we are going to announce major performance-related features in the coming months. Please stay tuned!