Scramjet is an interception-based web proxy developed by Mercury Workshop

• Chunked Rendering: As soon as the first byte of HTML arrives, the rendering engine kicks in. It doesn't wait for CSS or JS to download.
• DOM-in-Flight: The browser maintains a "draft DOM." When you click a preloaded link, it doesn't navigate—it commits. The page transforms instantly because 95% of the assets are already in cache. The only delay is the network round-trip for the dynamic data (the "squirt of fuel").

scramjet engine

But what if a browser worked more like a —an air-breathing jet that scoops up oxygen at hypersonic speeds without moving parts?

Mercury Workshop

"Scramjet" usually refers to a high-performance web proxy developed by , designed to bypass internet filters and browser restrictions. It works by using Service Workers to intercept network requests and a WASM-based rewriter to modify web content on the fly, making it one of the most advanced "browser-inside-a-browser" tools available. How to Use Scramjet Browser

The development team is currently working on Scramjet v3.0, which will compile stream transforms to WebAssembly (WASM). This means the browser will work by running your filters directly on the network card’s DMA (Direct Memory Access), bypassing the CPU almost entirely. Early benchmarks suggest 40 Gbps processing on a single machine.

It’s not all hypersonic yet: