Hi nicolebtesh!
Thanks for the information about your file’s set up!
If a large number of unoptimized, high resolution images are placed on a page, this can add a heavy load to the project page, and may impact performance. Image optimization decreases the file size of the image, so that the page can more quickly load into a web browser. This decrease in file size can inherently decrease to the image quality slightly, but I am sorry to hear that you’ve experienced such a significant decrease in image sharpness for your projects when using this feature!
I did want to clarify whether this decrease in image quality was specific to some browsers (Internet Explorer and Microsoft Edge, for example), or if the decreased quality was the same across all web browsers. If this behavior is occurring only in specific browsers, there could be another issue involved in the quality or performance behaviors you are experiencing. If you would be interested in sending in the files to support@axure.com for further review, we may be able to look into other methods for improving the performance for these images, or see if any other issues are involved in the change in image quality for these web browsers.
Please let me know if this is not the case, and I’ll be happy to file a feature request regarding improvements to optimized image sharpness with our respective teams on your behalf.
Thank you!