We are experiencing a similar issue with our application (7.4). On an average an IE11 32 process is consuming around 650-700 MB of memory when we run our application. There is slowness across the board. However when we switch to Chrome the application would just breeze past. We have created our own skin, could that be contributing to this slowness. Why is application running exceptionally slow in IE11?
Well I can use all the tools available but the point is, the auto generated UI is expected to be browser agnostic. If it is not, either the auto generated code needs fixing or the browser. I expect Pega to tell us the recommended browser for 7.4, HTML5 readiness does not guarantee the same experience in IE and Chrome.
For such behaviour , We can run the performance profiler and can check which API are taking more time.
Different browser will compile and execute the code in thier own fashion and can cause the prefromance issue. Some time In Pega also we have seen that some API/code are modified to acheive good performance. So the first point is we need to idenitify the area of the issue and then some commenting on that will be useful.