OCaml 5 introduced multicore support with a significant overhaul of the garbage collector and memory allocator. Semgrep faced memory consumption regressions when upgrading to OCaml 5. Initial investigation pointed to the lack of garbage collector compaction. Second attempt with OCaml 5.2 and compaction still had problems. Memtrace was used to profile memory usage. Backporting memory profiling to 5.2 was done. Comparison between OCaml 4 and 5 showed increased live memory in OCaml 5. Garbage collector tuning experiments with space_overhead showed positive results in some cases but not in others. A dynamic garbage collector tuning utility was developed using GC alarms and stats functions. It adjusts space_overhead based on heap size. The utility has been open-sourced. Future work includes using live memory instead of heap size, using a more sophisticated controller like Go's, and making GC tunable by end users. Join Semgrep's Community Slack for updates. Semgrep helps security teams partner with developers and provides confidence in surfacing actionable issues.