bug: WebKit WebProcess consuming 90-110% CPU on Ubuntu 26.04 + NVIDIA #20056

Bug Report: WebKit WebProcess consuming 90-110% CPU on Ubuntu 26.04 + NVIDIA

Environment

• OS: Ubuntu 26.04 (Resolute Raccoon development branch)
• Kernel: 7.0.0-10-generic
• GPU: NVIDIA GeForce GTX 1060 6GB
• Driver: 580.126.09 (January 2026)
• OpenCode: Latest version
• Session: Wayland

Problem

The WebKit WebProcess (used by OpenCode for rendering) consumes 90-110% CPU continuously, causing:

• High CPU usage
• Fans spinning constantly
• System responsiveness degradation
• GPU not being utilized (0% utilization despite NVIDIA driver loaded)

Steps to Reproduce

1. Install Ubuntu 26.04 with NVIDIA driver
2. Install OpenCode desktop
3. Start OpenCode
4. Monitor CPU usage with top or htop

Expected Behavior

• WebKit should use GPU acceleration
• CPU usage should be low when idle
• GPU should be utilized for rendering

Actual Behavior

• WebKit WebProcess at 90-110% CPU
• GPU at 0-17% utilization
• System fans spinning constantly

Additional Information

• Same hardware works fine on Windows
• Issue persists after system restart
• NVIDIA driver loaded but not utilized for rendering
• Mesa and NVIDIA EGL vendors both configured

Logs

PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
4475 sandro    20   0   72.8g 634764 215620 R  90.9   2.0   4:31.06 WebKitWebProcess