Cargo Features

maxminddb has no features set by default.

[dependencies]
maxminddb = { version = "0.27.3", features = ["simdutf8", "mmap", "unsafe-str-decode"] }
simdutf8

SIMD-accelerated UTF-8 validation during string decoding

Enables simdutf8

mmap = memmap2

Memory-mapped file access for better performance in long-running applications

unsafe-str-decode

Skip UTF-8 validation for maximum performance (mutually exclusive with simdutf8)

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

memmap2 mmap?