Telerik KendoUI Mvc SSRS Slow - reporting-services

So I recently installed Telerik UI for ASP.NET MVC and it seems to have totally bodged my SSDT/SSRS projects in visual studio. The projects work but can take upwards of 20-30 seconds to save making them basically unusable.
Originally we thought this issue may have been have been something to do with ReSharper however having contacted their support and done some captures they said that it looked like Telerik was the culprit.
Extract from the capture trace here...
Having uninstalled Telerik completely low and behold my save speeds go back to normal (less than a second).
Now full disclaimer - we are not using the most up to date version of Telerik (it's a slightly older version 2018.2.620) as this is the version we are licensed for which I would like to think wouldn't make a difference but putting it here just in case!
Has anyone else experienced this issue with SSRS projects? It's strange as, as far as I can tell, there is nothing in the project that should be referencing any MVC/Telerik code.
We have tried this on multiple machines and all seem to suffering the same problem although looking at Google I can't find anyone else reporting the same issue... Annoyingly I can't post of the telerik forums directly as they only let you do that if you have an active account...
If anyone can assist I would really appreciate it!

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Have come through many microsoft hot fixes, they were working in local environment, but in the live server there was no result.
Setting up Page.ClientTarget = "uplevel" (preferably in a header or footer page) has really solved the issue. I think this the best solution, as your .net application may not detect any other browser in future. But then we may have to wait and see, if this fix has any side effects.

Anyone have issues with using a RadTextBox in a MultiView?

I am want to use a Telerik RadTextBox inside a MultiView in ASP.NET 2.0. Just dragging a RadTextBox into a view and running the page generates a run-time error of the good old favorite "Object reference nto set to an instance of an object". It seems to be breaking on the Telerik.WebControls.RadInputControl.SaveViewState() call.
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Thanks!
This happened to be an issue with RadInput for ASP.NET in one of my previous projects at some point. I got latest from the Telerik site and the exception was gone.
Btw, I switched to the ASP.NET AJAX version of the control already and encourage you to try it out. It is more advanced and have RadInputManager as an addition to speed up the performance when having many textboxes on the page.
Dick