Some Mac users indicate that system freeze when launching applications after upgrade to Mojave. Here some method may help to solve that:
Update the application to the latest version for MacOS Mojave: Remember to Open System Preferences → Security & Privacy → Privacy → Full Disk Access, otherwise, the apps are nor able to access user privacy data locations and some system resource paths.
Use Activity Monitor: Open Finder → Applications → Utilities → Activity Monitor, use it to force quit the unresponsive processes.
Check the Startup items on your Mac: Open Launchpad → System Preferences→ Users & Groups, remove unwanted startup items to lighter to reduce the burden of computer operation.
Delete junk files and uninstall unneeded apps: Open Finder → Applications or Documents, select delete the unneeded apps and useless files one by one manually to free up some storage for faster Mac.
To lighten your burden, you can hand over all those complicated and tedious work to MacBooster - An excellent Mac cleanup tool, offer three main functions with seven powerful tools, delete 20 types of junks thoroughly and uninstall apps completely, easy to manage your startup items and boost Mac to the peak performance.
1. Download MacBooster and open it.
2. Scan the Mac.
3. Choose to Fix or Delete.
Check out more useful tips:
How to Clean Up Junk Files on Mac
How to Free Up Mac Memory
How to Remove Adware, Malware, Spyware and Virus from Mac