In addition to @user2375955 answer here are some usefull tips to enhance performance:
- Make sure you have latest service packpacks are installed
- Make sure you data is in geodatabase and not file based (e.g. shapefiles)
- Only leave layers on in your map document that are needed during simple panning and editing tasks
- Your onlineOnline basemaps should get faster as they re-cache when youusers zoom and pan around
- Use the Analyze Map tool to figure out what else might be slowing yourthe map performance
- When running geoprocessing tools on large datasets you may want to copy your input/output data locally for these tasks
Here are some additional links that may be helpful: