diff --git a/benchmarks/perf/horizon-win-9800x3d-5080-rd16.json b/benchmarks/perf/horizon-win-9800x3d-5080-rd16.json
new file mode 100644
index 0000000000..017c9cbec6
--- /dev/null
+++ b/benchmarks/perf/horizon-win-9800x3d-5080-rd16.json
@@ -0,0 +1,773 @@
+{
+ "format": "horizon-benchmark-report",
+ "version": 1,
+ "kind": "game",
+ "created": "2026-10-29T01:13:01Z",
+ "app": {
+  "name": "horizon-client",
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+ },
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diff --git a/benchmarks/perf/horizon-win-9800x3d-5080-rd32.json b/benchmarks/perf/horizon-win-9800x3d-5080-rd32.json
new file mode 100644
index 0000000000..3c686c57a1
--- /dev/null
+++ b/benchmarks/perf/horizon-win-9800x3d-5080-rd32.json
@@ -0,0 +1,773 @@
+{
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diff --git a/benchmarks/perf/horizon-win-9800x3d-5080-rd8.json b/benchmarks/perf/horizon-win-9800x3d-5080-rd8.json
new file mode 100644
index 0000000000..222de25b0b
--- /dev/null
+++ b/benchmarks/perf/horizon-win-9800x3d-5080-rd8.json
@@ -0,0 +1,773 @@
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diff --git a/benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd16.json b/benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd16.json
new file mode 100644
index 0000000000..36bb115554
--- /dev/null
+++ b/benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd16.json
@@ -0,0 +1,706 @@
+{
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diff --git a/benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd32.json b/benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd32.json
new file mode 100644
index 0000000000..1e3b64bdad
--- /dev/null
+++ b/benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd32.json
@@ -0,0 +1,706 @@
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diff --git a/benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd8.json b/benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd8.json
new file mode 100644
index 0000000000..1b57f0bc22
--- /dev/null
+++ b/benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd8.json
@@ -0,0 +1,706 @@
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index 0000000000..4aa077830a
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diff --git a/benchmarks/perf/vanilla-win-9800x3d-5080-rd32.json b/benchmarks/perf/vanilla-win-9800x3d-5080-rd32.json
new file mode 100644
index 0000000000..c374fb3b44
--- /dev/null
+++ b/benchmarks/perf/vanilla-win-9800x3d-5080-rd32.json
@@ -0,0 +1,690 @@
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diff --git a/benchmarks/perf/vanilla-win-9800x3d-5080-rd8.json b/benchmarks/perf/vanilla-win-9800x3d-5080-rd8.json
new file mode 100644
index 0000000000..53854b0266
--- /dev/null
+++ b/benchmarks/perf/vanilla-win-9800x3d-5080-rd8.json
@@ -0,0 +1,690 @@
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+}
diff --git a/benchmarks/perf/windows-9800x3d-5080-2026-10-29.md b/benchmarks/perf/windows-9800x3d-5080-2026-10-29.md
new file mode 100644
index 0000000000..b26c22fcc0
--- /dev/null
+++ b/benchmarks/perf/windows-9800x3d-5080-2026-10-29.md
@@ -0,0 +1,96 @@
+# Horizon v0.2.97 vs vanilla 26.3 on Windows 11: Ryzen 7 9800X3D + RTX 5080 (2026-10-29)
+
+The first `tools/perf_bench.py` run on Windows ([docs/benchmark.md](../../docs/benchmark.md)): Horizon, vanilla 26.3 and
+vanilla with performance mods, render distances 8, 16 and 32, 1280x720, three games each, every game from a fresh
+world. The reports are the `*-win-9800x3d-5080-rd*.json` files next to this page.
+
+```sh
+python tools/perf_bench.py --table horizon-win-9800x3d-5080 vanilla-win-9800x3d-5080 vanilla-mods-win-9800x3d-5080
+```
+
+## Setup
+
+- **Machine:** AMD Ryzen 7 9800X3D (8 cores, 16 threads), 94 GB RAM (DDR5, EXPO off), NVIDIA GeForce RTX 5080
+  (driver 617.42), Windows 11 Pro 26200, Balanced power plan, desktop. One 1920x1080 120 Hz display. The game windows
+  were on the desktop of an unlocked session.
+- **Horizon:** release v0.2.97 as the launcher installs it (`--build %APPDATA%\horizon-launcher\versions\v0.2.97`,
+  `--resources` its `.local\horizon-client\26.3`), Vulkan.
+- **Vanilla:** the 26.3 client jar with Fabric Loader 0.19.5 and the driver mod, Java 25.0.5 (Temurin), `-Xmx2G`
+  with the launcher's G1 flags and the manifest's `-XX:StackShadowPages=32`, OpenGL 3.3.
+- **Vanilla + mods:** the same with Sodium mc26.3-0.9.2, Lithium mc26.3-0.26.2, FerriteCore 9.0.0 and
+  ImmediatelyFast 1.17.1 (`tools/benchmark-deps/mods.lock.json`).
+- **Commands:** `python tools/perf_bench.py --game <game> --label <game>-win-9800x3d-5080 --distances <d>
+  --sizes 1280x720 --repeats 3` (plus `--build` and `--resources` for Horizon), with the games taking turns at
+  each distance.
+- **Memory** is the working set on Windows (what Task Manager shows), sampled from outside the process. Horizon's
+  GPU figure is its own Vulkan allocator total. `nvidia-smi` gives no per-process figure under WDDM, so vanilla has
+  none.
+
+## Load
+
+Windows has no load average, so the reports have no `load_avg_1m`. Other work was running on the machine (Rust builds),
+so a script started each game only after 15 s with no `rustc`, `cargo` or `link` process running and CPU load under
+30 %. It also logged the CPU load and the number of those processes every 5 seconds:
+
+| Game | RD | Mean / max CPU load (machine, the game included) | Compiler processes, mean / max |
+|---|---|---|---|
+| Horizon | 8 | 28 % / 72 % | 1.1 / 4 |
+| Vanilla | 8 | 47 % / 100 % | 1.7 / 5 |
+| Vanilla + mods | 8 | 53 % / 100 % | 1.3 / 3 |
+| Horizon | 16 | 29 % / 80 % | 0 / 0 |
+| Vanilla | 16 | 41 % / 91 % | 0 / 0 |
+| Vanilla + mods | 16 | 51 % / 90 % | 0 / 0 |
+| Horizon | 32 | 48 % / 100 % | 1.6 / 5 |
+| Vanilla | 32 | 48 % / 91 % | 0.1 / 2 |
+| Vanilla + mods | 32 | 53 % / 100 % | 1.2 / 7 |
+
+RD 16 ran on an otherwise idle machine. RD 8 and RD 32 had a few short builds running alongside. An earlier pass at
+RD 8 and 16 with builds running throughout (up to 24 compiler processes) gave up to 30 % lower FPS and confidence
+intervals several times wider; it was discarded and those distances were run again. Take RD 32, and Horizon's
+RD 32 lows in particular, as indicative.
+
+## Results
+
+Mean of 3 games ± 95% confidence interval. FPS over the 12-second flight at 16 blocks/s (average / 1% low /
+0.1% low):
+
+| RD | scene | Horizon v0.2.97 | Vanilla 26.3 | Vanilla + mods |
+| --- | --- | --- | --- | --- |
+| 8 | forest | 3155 ±478 / 874 ±396 / 529 ±232 | 2467 ±152 / 560 ±86 / 235 ±50 | 2281 ±47 / 632 ±33 / 241 ±23 |
+| 8 | mountain | 3153 ±103 / 961 ±133 / 536 ±143 | 2372 ±45 / 543 ±48 / 229 ±29 | 2370 ±191 / 644 ±107 / 231 ±25 |
+| 8 | ocean | 3016 ±199 / 880 ±138 / 548 ±97 | 2284 ±511 / 551 ±206 / 245 ±73 | 2211 ±319 / 618 ±76 / 224 ±25 |
+| 8 | village | 2707 ±245 / 840 ±273 / 494 ±154 | 2039 ±153 / 450 ±74 / 194 ±8 | 1918 ±68 / 485 ±31 / 177 ±23 |
+| 16 | forest | 2424 ±138 / 709 ±165 / 401 ±100 | 1912 ±324 / 402 ±89 / 149 ±25 | 1746 ±32 / 461 ±27 / 179 ±9 |
+| 16 | mountain | 1961 ±99 / 537 ±96 / 297 ±75 | 1653 ±153 / 332 ±27 / 113 ±8 | 1500 ±55 / 408 ±40 / 140 ±10 |
+| 16 | ocean | 2201 ±183 / 554 ±251 / 325 ±326 | 1861 ±289 / 446 ±142 / 165 ±29 | 1815 ±119 / 514 ±142 / 192 ±58 |
+| 16 | village | 1712 ±192 / 593 ±80 / 358 ±69 | 1218 ±65 / 318 ±16 / 127 ±5 | 1282 ±162 / 343 ±25 / 132 ±12 |
+| 32 | forest | 1273 ±51 / 330 ±144 / 153 ±119 | 1171 ±98 / 227 ±28 / 104 ±17 | 896 ±32 / 240 ±158 / 85 ±115 |
+| 32 | mountain | 929 ±143 / 175 ±109 / 75 ±57 | 795 ±33 / 51 ±11 / 7 ±2 | 637 ±3 / 158 ±11 / 83 ±37 |
+| 32 | ocean | 1068 ±82 / 113 ±23 / 44 ±17 | 1158 ±189 / 228 ±18 / 96 ±15 | 981 ±21 / 296 ±26 / 110 ±8 |
+| 32 | village | 1013 ±54 / 299 ±97 / 148 ±112 | 829 ±85 / 175 ±25 / 85 ±12 | 874 ±23 / 228 ±27 / 87 ±16 |
+
+Startup, loading and memory (means of 3 games):
+
+| RD | | Horizon v0.2.97 | Vanilla 26.3 | Vanilla + mods |
+| --- | --- | --- | --- | --- |
+| 8 | start to title / in-world | 3.3 s / 6.4 s | 7.8 s / 14.4 s | 10.9 s / 17.7 s |
+| 8 | mean scene load | 1.2 s | 4.0 s | 3.9 s |
+| 8 | working set, steady / peak | 1080 / 1174 MB | 1850 / 1976 MB | 1944 / 2050 MB |
+| 16 | start to title / in-world | 3.2 s / 7.2 s | 7.7 s / 19.9 s | 10.8 s / 23.5 s |
+| 16 | mean scene load | 2.4 s | 9.2 s | 9.0 s |
+| 16 | working set, steady / peak | 1236 / 1459 MB | 2300 / 2540 MB | 2327 / 2496 MB |
+| 32 | start to title / in-world | 3.7 s / 12.1 s | 7.5 s / 35.5 s | 10.6 s / 39.6 s |
+| 32 | mean scene load | 5.8 s | 21.4 s | 21.0 s |
+| 32 | working set, steady / peak | 1734 / 2052 MB | 2779 / 2871 MB | 2888 / 2972 MB |
+
+## What it shows
+
+- At RD 8 and 16, Horizon's average FPS is 18–41 % above vanilla's in every scene. Its 1% lows are 1.2–1.9 times
+  vanilla's and its 0.1% lows 2.0–2.8 times. On this CPU and GPU the performance mods leave vanilla's averages
+  level or slightly lower, and raise its 1% lows by 8–23 %.
+- At RD 32, Horizon is ahead in the forest, mountain and village averages. Over the ocean its average is level with
+  vanilla's, and its lows are about half of vanilla's and of the modded client's (113 vs 228 and 296 FPS 1% low).
+  That scene is worth a closer look, though builds were running during Horizon's RD 32 games.
+- Horizon reaches the title screen 2–2.4 times faster than vanilla (about 3 times faster than the modded client)
+  and loads a scene's chunks 3–4 times faster. Its steady working set is 38–46 % smaller.
+- Each game uses its own graphics API: Horizon Vulkan, vanilla OpenGL. That difference is part of what's compared.
diff --git a/docs/benchmark.md b/docs/benchmark.md
index 71776b1d08..1e06feac82 100644
--- a/docs/benchmark.md
+++ b/docs/benchmark.md
@@ -62,3 +62,5 @@ On Windows, run `python tools\perf_bench.py ...` the same way. Horizon's control
 ## Results
 
 Saved runs go to `benchmarks/perf/`; `--table` prints them as Markdown.
+
+- [Horizon v0.2.97 vs vanilla 26.3 on Windows 11, Ryzen 7 9800X3D + RTX 5080](../benchmarks/perf/windows-9800x3d-5080-2026-10-29.md) (2026-10-29)