Long delay when selecting objects

I’m running Blender 2.9a on Vista 32bit. I’ve got an ATI Mobility Radeon X2300 card.

When I select an object, especially in a complex scene, blender freezes for as much as 10 seconds before responding. Does anyone else have this problem? Interestingly, it’s only happened since I updated my drivers. I don’t want to downgrade them because it’s made everything else run much faster.

PS: If I select an object in wireframe view the delay is much smaller.

Bump. Anyone?

Oh, and if I select an object by clicking its name in the outliner, there is no delay. Is anyone else having this problem? It’s making blender completely unusable.