Well, It would be difficult to guess why your application got slower and how much and why your full text search is affecting your other part of the application without seeing your application design/architecture.
I would suggest try to explore the reason why it slows down the application instead of simply guessing something. Your guess may or may not be correct.
I am trying to Response.Redirect to another web application but ASP.NET keeps corrupting the URL. Example, if i am at "http://localhost/application1/main.aspx" and i do redirect to "http://localhost/application2/default.aspx" the redirected url will become "http://localhost/http://localhost/application2/default.aspx". It is as if ASP.NET is guessing that i am redirecting using partial URL, but i am not. How does one fix this?
Just to be clear you are talking about a Windows app loading a portion of a webpage correct? If so then you would need to get the portion of HTML you need and insert it into the WebBrowser control, you can't request a portion of a web page unless it is available from the content provider as such.
Please check whether you have created ServiceMethod named GetSlides properly. Moreover, pls check for other controls have created the same id as you have defined in properties: lblDesc, btnNext, btnPrev for their corresponding controls.
If you are still getting problem, you can download the Ajax Control Toolkit Sample Application and see the code sample how it is working.
Do other controls of the sample code are working on your system? if not, then, you may try re-installing Ajax Toolkit.
If yes, Try to debug the code and find out what error it is throwing/ where it got struck.