Developed a performance-focused kernel security optimization for the KernelSU repository, implementing a caching layer for SELinux Security Identifier (SID) lookups targeting the su, zygote, and init domains. This work replaced repeated string-based SID resolutions with efficient integer comparisons, reducing overhead during security context checks and improving evaluation latency under both normal and peak loads. The solution was built in C, leveraging kernel development and security architecture expertise to establish an init-time cache that avoids per-check string operations. The changes laid the groundwork for scalable security policy evaluation, with code fully documented and integrated through a signed-off commit to KernelSU.