Optimize allocations in read/write checks

Editor assessment

Adequate but shallow for a performance commit. The subject names the area, read/write checks in the runtime, and the technique, optimizing allocations, and all structural conventions hold: perf type, runtime scope, imperative lowercase phrasing, short length. What it lacks is any measurable substance; 'optimize allocations' covers everything from removing a Vec to eliminating a clone, and without a body or benchmark figures the reader cannot judge impact or risk. Perf changes to op dispatch paths deserve at least a line of numbers. As is, the message functions as a signpost but not as documentation of the improvement.