Intel Bug and memory

Hello guys, I am interested in the topic that Intel’s processors have a security bug and the fix could slow down PCs.
Talking about the Intel bug, any impact on computing performance (whether client PCs, or servers)
– how serious is the issue????
– Are there different applications that get slowed down more?
– Any differences between Client PCs and Servers
– Any differences between Intel chips and AMD chips?
– Are hackers actually exploiting this vulnerability?