Links containing "Virtual tours" and 3D photography (of houses, museums etc., see link below) consumes close to 100% of CPU in Opera. For a comparison, Chrome browser takes about 15/20% and Edge about 10% or less.
Surprisingly, these do cause increased GPU usage.
https://homes.co.nz/address/paraparaumu/paraparaumu/6-lambert-way/xOeE5/gallery/virtual-tours/1
Even a simple one like this: https://virtual-tours.com.au
Opera version:83.0.4254.62
--extensions disabled
--customisation includes only bookmarks
OS: Microsoft Windows 11 Pro 10.0.22000:
Laptop: Acer Extensa 215-54
processor: Core i5, 8logical CPU's
Memory: 8GB