Brave has overhauled its Rust-based adblock engine to reduce memory consumption by 75%, bringing better battery life and smoother multitasking to all users.

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Brave reduced its adblock engine memory consumption by 75% (roughly 45 MB savings) through a Rust-based architectural overhaul using FlatBuffers. The optimization moved 100,000 adblock filters from heap-allocated data structures to a zero-copy binary format. Additional improvements include 19% fewer memory allocations via stack-allocated vectors, 13% faster filter matching through regex tokenization, and 30% more efficient internal storage. These native browser-level optimizations are impossible for extension-based blockers constrained by browser APIs, and remain unaffected by Manifest V3 restrictions.

Brave overhauls adblock engine, cutting its memory consumption by 75%