Loss of Performance / Low FPS in Google Maps Using CarPlay

I'm experiencing a rather sudden loss of performance while using Google Maps via CarPlay in my vehicle. Previous to iOS 18.5 I enjoyed a perfectly acceptable framerate in my head unit whilst using G Maps, even in fullscreen, which hovered around 30 fps by my reckoning. Since 18.5, performance is approximately halved and is so jarring I find it unusable, even when run using half the screen. I am not alone; there is a Reddit thread here that accurately depicts what I am experiencing. I've tried the most common answer (delete local app data on the app in-phone) with no change. I'd love to get this surfaced to Apple in hope the issue can be addressed.

Specs:

iPhone 16 Pro, iOS 18.5

Google Maps 25.25.3.772132****

Wireless Carplay on a 2024 Porsche using PCM 6.0

[Edited by Moderator]