Zero-copy rasterizer caused reproducible tab crashes on any page with <video> and GPU decoding enabled. This flag is dangerous for general use.
| Metric | Default (copy) | Zero-copy ON | Δ | | --- | --- | --- | --- | | Scrolling smoothness (MotionMark) | 812.5 | 798.2 | -1.8% (regression) | | First paint (ms) | 214 ms | 221 ms | +3.3% slower | | GPU Memory (MB) | 342 MB | 358 MB | +4.7% | | Stability | Stable | Crashes on YouTube (Hardware-accelerated video) | |
Because these features are and in active development, they come with risks: opera:flags experiments
#tab-hover-cards Why use it? If you have 20 tabs open and can no longer read the titles, this feature creates a small preview "card" that pops up when you hover your mouse over a tab. Some versions even allow for visual page previews (Tab Hover Card Images), helping you find the right tab without clicking it.
GPU rasterization significantly improves graphics-heavy benchmarks but nearly doubles GPU memory. No JavaScript performance regression. Zero-copy rasterizer caused reproducible tab crashes on any
| Risk Level | Definition | Examples | Recommendation | | --- | --- | --- | --- | | | Changes UI or non-critical features; no crash potential. | #sidebar-panels , #smooth-scrolling | Safe for power users. | | Medium | Affects rendering, networking, or storage; may cause performance degradation but not crashes. | #enable-gpu-rasterization , #parallel-downloading | Test before daily use. | | High | Disables security features, modifies low-level memory handling, or known to crash. | #enable-zero-copy-rasterizer , #disable-sandbox , #enable-quic (deprecated) | Do not enable. |
: Erase any existing text in the Opera or Opera GX address bar. Enter the command : Type opera://flags and press Enter . If you have 20 tabs open and can
Offloads the task of rendering website images and text to your graphics card, often resulting in smoother scrolling. The "Danger Zone" Warning