Internet Optimizer for Windows

Measure your connection → fix only what's actually broken → prove it helped. No boosters, no snake-oil, no third-party downloads — just documented Windows networking settings, every change backed up and reversible.

---

⚡ Quick start

Get it on your Windows PC — open PowerShell and paste:

cd $env:USERPROFILE\Downloads
irm https://raw.githubusercontent.com/khaledq84ever/net-optimizer/main/Optimize-Internet.ps1 -OutFile Optimize-Internet.ps1

Then run it (it auto-elevates — click Yes on the UAC prompt):

# Recommended — reads your speed, fixes only what's wrong, re-tests to prove it:
powershell -ExecutionPolicy Bypass -File .\Optimize-Internet.ps1 -Auto

# Add a shareable HTML report (great for sending your ISP):
powershell -ExecutionPolicy Bypass -File .\Optimize-Internet.ps1 -Auto -Report

# Changed your mind? Undo everything:
powershell -ExecutionPolicy Bypass -File .\Optimize-Internet.ps1 -Revert

Even easier: copy Run.bat + Optimize-Internet.ps1 into one folder, double-click Run.bat, and pick [1] AUTO. No typing.

---

📊 What it measures

Metric	Why it matters
Download / Upload	Real line speed — uses 4 parallel streams (a single stream undercounts fast connections).
Ping + Jitter	Latency and its stability. High jitter is what makes calls/games stutter even when the average looks fine.
Bufferbloat ⭐	How much your ping spikes under load — graded A+ → F. The #1 cause of lag on otherwise-fast lines, and most speed tests never show it.
Packet loss	Dropped packets — usually Wi‑Fi signal or ISP.
DNS time	Tests Cloudflare / Google / Quad9 / OpenDNS / your current one and picks the fastest.
First-hop latency	Pings your home router to tell you whether the bottleneck is your network vs your ISP.
Bandwidth hogs	Lists the top processes by open TCP connections — surfaces OneDrive / Steam / Windows Update silently using your line.
Quality score	One objective A+ → F grade for responsiveness, independent of how big an ISP plan you pay for.

Download — 4 parallel streams measure the real line speed

Upload — reclaim what Windows is giving away

DNS shootout — fastest resolver for your location, automatically

Bufferbloat — the headline metric

Shareable HTML report (-Report)

---

🔧 What it changes (only with -Auto or -Apply)

1. Fastest DNS — tests the major resolvers + your current one, sets the quickest.
2. Removes Windows' network throttle (NetworkThrottlingIndex).
3. TCP autotuning + RSS so big downloads ramp to full speed.
4. TCP ECN enabled — lets modern routers signal congestion before dropping packets (fewer retransmits, smoother throughput).
5. TCP Timestamps off — removes 12 bytes/packet of overhead modern TCP doesn't need.
6. Reserved bandwidth → 0% — Windows reserves 20% of every NIC for QoS-tagged traffic by default; on home PCs nothing actually uses it, so this frees it for every app.
7. Delivery Optimization upload cap (20%) — stops Windows Update from peer-sharing to other PCs at full upload, which silently throttles your uploads.
8. Stops adapter power-saving (a top cause of Wi‑Fi slow-downs and drops).
9. Energy Efficient Ethernet (EEE) off — known cause of latency spikes & packet loss on wired NICs; auto-skipped if your adapter doesn't expose it.
10. High-performance power plan.
11. Optimal MTU (only if it detects a clearly better value).
12. (optional) -Gaming — lowers latency by disabling Nagle's algorithm.

Plus two read-only diagnostics added every run (no changes applied):

• First-hop / gateway latency — distinguishes "home network slow" vs "ISP slow" so you know who to call.
• Top bandwidth-using processes — surfaces hogs like OneDrive / Steam / Windows Update that secretly eat your bandwidth.

-Auto is the smart mode: it reads your current settings and changes only the things that are actually wrong, leaving anything already-fine untouched. Everything it touches is backed up first to net-backup-*.json, undoable with one command.

Honest at-a-glance — every change, with its real-world effect

Reference run — before vs. after on real Windows (CI)

It can't make your internet faster than your ISP plan. What it does is remove the things that keep Windows below that ceiling: slow DNS, the built-in network throttle, Wi‑Fi/NIC power-saving, and poor TCP settings.

---

🖥️ How to run

Easiest — double-click Run.bat

  [1]  AUTO  (recommended)   read -> find problems -> fix only those -> re-test
  [2]  Measure only          (changes nothing)
  [3]  Optimize ALL          (apply every tweak)
  [4]  Optimize ALL + Gaming
  [5]  Undo / Revert
  [6]  Exit

Manual (PowerShell, as Administrator)

.\Optimize-Internet.ps1                 # measure only — changes nothing
.\Optimize-Internet.ps1 -Auto           # fix only what's broken, then re-test
.\Optimize-Internet.ps1 -Apply -Gaming  # apply everything + low-latency tweak
.\Optimize-Internet.ps1 -Revert         # undo, restore the last backup

Add -Report to any run to also drop a styled net-report-*.html next to the script and open it.

The script auto-elevates to Administrator (you'll see a UAC prompt — click Yes). -ExecutionPolicy Bypass just lets the script run this once; it changes no system policy.

---

📡 Stability watchdog — stop random drops

If your connection randomly drops, run the watchdog. It pings continuously and:

• logs every drop to a timestamped CSV (net-watchdog-*.csv) with outage duration — proof for your ISP ("it dropped 14× yesterday, 6 min total"),
• prints a live heartbeat (uptime %, outage count),
• on a sustained outage (with -AutoReset) auto-resets the adapter to recover,
• prints an uptime summary when you stop it (Ctrl+C).

.\Optimize-Internet.ps1 -Watch              # monitor + log
.\Optimize-Internet.ps1 -Watch -AutoReset   # also auto-reset during a long outage

---

✅ Is it safe?

• Measure-only by default — nothing changes unless you pass -Auto/-Apply.
• Every changed setting is saved to a backup file before the change.
• -Revert restores that backup; a reboot helps TCP/MTU changes fully settle.
• No third-party downloads, no "boosters", no registry voodoo — only documented Windows networking settings.

Requirements

• Windows 10 or 11 (also works on Win8.1 / Server with the networking cmdlets).
• Windows PowerShell 5.1 (built in) or PowerShell 7+ — both supported.
• Run as Administrator (the launcher does this for you).

The script preflight-checks all of this and exits cleanly with a clear message if something's missing — it won't half-run or crash.

---

🧪 Tested on real Windows in CI

Every push is validated by GitHub Actions on a real windows-latest runner — not just parsed/linted, actually executed. Two workflows guard it:

• Test on real Windows — runs the script in PowerShell 7, supports workflow_dispatch with a mode dropdown (measure-only / report / apply / revert), uploads the log + HTML report + backup JSON as artifacts.
• Regular-user experience test — a 3-scenario matrix simulating exactly what an end user does: extracts a downloaded zip and runs it via Windows PowerShell 5.1 (default on every Win10/11), PowerShell 7, and Run.bat. Files are marked web-origin first so SmartScreen/AMSI behave realistically.

Click Actions → Test on real Windows → Run workflow to fire either workflow yourself with the mode of your choice. Latest reference apply-mode run on a 100 Gbps Hyper-V NIC produced:

Metric	Before	After	Change
Download	1793.3 Mbps	2051.2 Mbps	+14.4 %
Upload	48.8 Mbps	248.3 Mbps	+408 %
DNS (Cloudflare)	11.4 ms	6.8 ms	−40 %

Backup file was created, -Revert was verified to undo every one of the 12 changes.

---

_{MIT licensed · measure → backup → revert · no boosters, ever}