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+# Phase 1 gate — mongo-lite vs MongoDB 8.3.7, 1g dataset / ~16k docs
+# ratio < 1.0 = mongo-lite faster. Reproduce: bash tests/e2e/compare-run.sh 1g 16k
+# commit: 9eecb50
+
+benchmark                                   mongo-lite              mongodb                 ratio
+insertOne (sequential) x200                 0.19 ms                 5.1 ms                  0.0x
+bulk insert throughput                      755.6 MB/s              688.7 MB/s              1.1x
+docs loaded                                 65,536                  65,536                  1.0x
+createIndex({k: 1})                         60.2 ms                 80.6 ms                 0.7x
+countDocuments({})                          2.1 ms                  13.8 ms                 0.2x
+findOne({_id: <ObjectId>})                  0.53 ms                 0.84 ms                 0.6x
+findOne({k: 500}) (indexed)                 0.55 ms                 1.7 ms                  0.3x
+find({p: {$gte,$lt}}).count() (scan)        20.5 ms                 13.1 ms                 1.6x
+find({}).sort({_id:-1}).limit(20)           6.7 ms                  2.5 ms                  2.7x
+find({}, {proj}).limit(1000)                3.5 ms                  4.4 ms                  0.8x
+aggregate $group by k                       10.3 ms                 12.9 ms                 0.8x
+updateOne({_id}) x50                        0.14 ms                 0.19 ms                 0.7x
+updateMany({k: 7}, {$inc})                  16.2 ms                 6.5 ms                  2.5x
+deleteOne({_id}) + insertOne                0.61 ms                 5.0 ms                  0.1x
+node client RSS                             152 MB                  156 MB                  1.0x
+server RSS                                  1975 MB                 1379 MB
+kill -9 reopen                              0.8s                    1.3s
+db on disk                                  1025MB                  92MB
+
+# Baseline before Phase 1, for reference:
+#   bulk insert 267 MB/s | createIndex 0.66s | sort+limit 40ms
+#   range-scan 25ms | updateMany 20ms | reopen 3.8s | disk 1.0GB | RSS 2.0GB
+#
+# Remaining gaps and where they are addressed:
+#   db on disk   11x  -> Phase 3 (block-compressed log)
+#   sort+limit  2.7x  -> Phase 2 (index-ordered scan, _id as an ordered index)
+#   updateMany  2.5x  -> Phase 2 (B+tree: remove_id is a linear scan per index)
+#   range-scan  1.6x  -> 1.9 (per-field-per-doc allocation in the matcher)
+#   server RSS  1.4x  -> Phase 4 (per-document arena -> byte storage)