# Servo 0.6 adds CSS Grid support, Threadboost cuts Speedometer time in half

> **Key takeaway:** Servo 0.6 shipped with working CSS Grid support and an experimental Threadboost feature that improves Speedometer scores by 50%.

**Published:** 2026-10-18T10:05:40+00:00 
**Source:** Phoronix Benchmarks & Drivers 
**Category:** kernel-os 
**Canonical URL:** https://fosswire.org/news/servo-06-adds-css-grid-support-threadboost-cuts-speedometer-.html 

## Summary
The Rust-based Servo browser engine released version 0.6 with CSS Grid support, enabling many more websites to render correctly. Other additions include CSS color-scheme, animation-composition, and text-transform support, plus new DOM APIs. Servo upgraded to SpiderMonkey 153 for security fixes and added an optional disk-backed HTTP cache. An experimental Threadboost optimization is showing 50% improvement on the Speedometer benchmark.

## What's new in Servo 0.6
- **CSS Grid**: now functional, expanding site compatibility significantly
- **Threadboost**: experimental performance feature yielding 50% Speedometer improvement
- **SpiderMonkey 153**: pulled in for security and crash fixes
- **Disk-backed HTTP cache**: optional, currently without manual clear capability
- **Additional CSS features**: color-scheme, animation-composition, full-width, text-transform
- **DOM APIs**: new implementations landed
- **Accessibility and AudioWorklet**: ongoing work and prep

## Why it matters
CSS Grid support removes a major compatibility barrier for Servo as a viable alternative browser engine. The 50% Speedometer gain from Threadboost, if it holds, could position Servo more competitively against mainstream engines on performance-critical workloads.