Hi nicolebtesh!
Thank you very much for the feedback. I’ve now filed a feature request on your behalf. We do have a bug report on file regarding images becoming blurry when cropped or sliced, and I have already added a note to this report regarding your experience.
I did want to let you know that we have seen some cases where users that were experiencing performance issues for heavy-load pages saw improvement when using the Axure RP 9 beta. If you would like, please feel free to download the Axure RP 9 beta here and see how the project performs using Axure RP 9.
Please note that because the Axure RP 9 application is still in beta, we strongly recommend maintaining a separate file for the version opened in Axure RP 9 so your Axure RP 8 file is not overwritten.