I’ve found that Windows Defender seems to significantly slow down VS syntax highlighting/IntelliSense. Exclusions on VS processes and the folder for the project helps significantly. Bear in mind, there’s security risks in doing this.
Furthermore, compiling in VS2022 and then Right Click → Rescan → Rescan File helps a lot and often solves highlighting problems with things like RPC routines (e.g., UFUNCTIONs marked with Server, NetMulticast, Client - where the implementation has to have _Implementation at the end). With the RPC routines, you must compile before the rescan will solve the highlighting issues with it.
If both of those two things fail and so does refresh VS solution from within Unreal editor top menu bar, then delete the compiled Binaries and rebuild the project whilst Unreal is closed.
One more thing: Hot Reload works better for me on UE5 (5.0.2) than the new Live Coding. If you change header files, close the editor and then compile from VS, then reopen the editor. Sometimes using Hot Reload doesn’t work even when the engine doesn’t crash as well, such as newly compiled binaries not being properly loaded over the old ones, so you’ll want to regularly compile without using Hot Reload anyway. Closing the editor and compiling in VS even if you haven’t made any changes will show you on the Output window that hot reload binaries are being removed, too.