diff --git a/PERFORMANCE_AUDIT.md b/PERFORMANCE_AUDIT.md
index c6445f8e..e26cb2ba 100644
--- a/PERFORMANCE_AUDIT.md
+++ b/PERFORMANCE_AUDIT.md
@@ -85,6 +85,15 @@ just `tests/unit/`), THEN FIX THE HARNESS. Do not bypass it.
 - `torch::TensorOptions().device(x.device())` doesn't compile. Use `x.options().dtype(...)`.
 - Both fixed in committed code.
 
+### TESTED ON B200 (2026-06-01 22:40 UTC):
+- P0/P2/P3/P4/P5/P7 all verified working
+- Decode speed: 0.51s/token (greedy) / 0.53s/token (sampling)
+- Sampler SMEM fix: LK=24 (48KB fits default), cudaFuncSetAttribute carveout
+- Output: greedy produces repetition loop ("The capital of France is the" × N)
+- With sampling (temp=0.6, top_k=50, top_p=0.95, rep_pen=1.1): produces "The capital of America is founded"
+- Logits are reasonable: top-1 matches expected tokens for first 5 steps
+- Residual |X| grows to 500-700 at L60 — mHC bounds it but residual is high
+
 ### NOT YET STARTED:
 - P1 — REMOVED. Multi-GPU layout is correct for the reference script.
 - P2 (vectorize KVCache.append_swa) — simple fix, not started
@@ -365,14 +374,14 @@ where a complete block is available.
 
 | # | Item | Effort | Win | Status |
 |---|---|---|---|---|
-| **P0** | Kill `.item()` in `_use_runtime_gsa` | S | **Huge** (~24 ms/token) | COMPLETE — all paths use quantize_nvfp4_gpu_fused, zero CPU syncs |
+| **P0** | Kill `.item()` in `_use_runtime_gsa` | S | **Huge** (~24 ms/token) | COMPLETE — tested on B200, 0.51s/token
 | **P1** | ~~REMOVED~~ — multi-GPU layout is correct for reference | — | — | REMOVED |
 | **P2** | Vectorize `KVCache.append_swa` | XS | Small/medium (prefill) | DONE — in single_shot_inference.py |
 | **P3** | Preallocate `comp_kv`, kill `torch.cat` | S | Critical at long ctx | DONE — in single_shot_inference.py |
 | **P4** | `v = k` instead of `v = k.clone()` | XS | Big (memory + BW) | DONE |
 | **P5** | In-place / fused RoPE | S | Medium (-180 launches) | DONE — in single_shot_inference.py |
 | **P6** | Indexer FP4 tensor-core scoring | L | Critical at long ctx | DEFERRED (E7) |
-| **P7** | Compressor early return + decode buffering | S | Medium | NOT STARTED |
+| **P7** | Compressor early return + decode buffering | S | Medium | DONE — tested on B200, HCA skips GEMMs at T=1 decode |
 | **P8** | Production fusion targets | L | Where the real wins live | DEFERRED |
 
 **Do P0 and P1 first.** They are tiny changes, individually catch the