[codex] Add async loading and performance caches

.github/workflows/pr-verify.yml

@@ -34,6 +34,30 @@ jobs:
         run: |
           cargo publish -p i3rs-core --dry-run
 
+  perf-benches:
+    name: Perf Benches (report only)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+        with:
+          lfs: true
+
+      - uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
+
+      - uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4 # v2
+
+      - name: Run perf benches
+        run: cargo bench -p i3rs-core --bench perf_benches -- --output-format bencher | tee perf-bench-output.txt
+
+      - name: Upload perf bench report
+        if: always()
+        uses: actions/upload-artifact@65462800fd760344b1a7b4382951275a0abb4808 # v4
+        with:
+          name: perf-bench-output
+          path: |
+            perf-bench-output.txt
+            target/criterion
+
   build-matrix:
     name: Build (${{ matrix.name }})
     runs-on: ${{ matrix.os }}