Hi again,
#1. You can use Widget Image slider to replace Revolution Slider.
#2. Website speed optimization:
1. Please check all your plugins and remove unnecessary plugins.
2. Turn off all 3rd party services like google, youtube, facebookj
3. Double check your hosting and make sure you have the best hosting package possible
#3. It may be due to a conflict with some plugin on your website, currently we have not found a way to fix this problem