Vivaldi 6.8 enhances browser performance with real-time memory usage monitoring and automatic tab hibernation. It also comes with Vivaldi Mail 2.0, which introduces prefetching, quick reply, and an undo feature.
https://alternativeto.net/news/2024/6/vivaldi-6-8-released-with-real-time-memory-usage-enhanced-break-mode-and-vivaldi-mail-2-0/