Power-plan test · system-wide change
Ultimate Performance changes the active Windows power scheme for the whole PC. It may reduce some power-management latency, but it cannot create CPU capacity, remove a Roblox bottleneck, or guarantee more FPS.
powercfg /getactivescheme. That GUID—not the Luczystrap toggle—is your exact route back.powercfg /getactiveschemepowercfg /setactive ORIGINAL_GUIDHistorical warning: Luczystrap 1.3 performed no Windows restore action when this toggle changed to off.
01 / Device decision
Select the closest device. Availability and the correct alternative depend on the Windows power model, power source, policy, and cooling.
Choose the system
A desktop with traditional power plans is the clearest use case. Keep the workload, room temperature, background load, and Roblox scene matched.
Ultimate Performance as one temporary variable.
Frame time, temperature, clocks, fan noise, and wall power.
Stop when: heat, noise, power, stability, or another system metric regresses without a repeatable frame-time gain.
02 / Evidence boundary
Current application source is closed. The exact code is historical 1.3 evidence; the actual Windows state is the verification target for 1.4.9.
Microsoft identifies every power plan by a GUID and allows only one active plan. /getactivescheme reads it; /setactive changes it.
The public method launched /duplicatescheme e9a42…, then /setactive e9a42…. It did not capture the new GUID returned by duplication or check either exit code.
The historical setter called Windows only when the boolean became true. Turning it false stored the preference but did not reactivate the previous plan.
03 / Code audit
This audit prevents the UI label from becoming a guarantee about command success, active state, or rollback.
| Historical step | What the code did | What it did not prove |
|---|---|---|
| Toggle enabled | Saved SetUltimatePerformance = true and called the Windows tweak method. | No current 1.4.9 implementation proof.Historical only |
| Duplicate scheme | Started powercfg /duplicatescheme e9a42b02-d5df-448d-aa00-03f14749eb61. | Did not read the new GUID that Microsoft says the command returns.GUID not captured |
| Activate scheme | Started powercfg /setactive e9a42b02-d5df-448d-aa00-03f14749eb61. | Did not use the returned duplicate GUID or inspect a non-zero exit code.Verify Windows |
| Success log | Logged “activated” after both processes completed without a .NET exception. | Process completion alone did not prove both commands succeeded.Log is not state |
| Toggle disabled | Saved SetUltimatePerformance = false. | Did not call powercfg, record the old plan, or restore it.No old undo |
04 / Before enabling
Open Windows Terminal. The first three commands read state only. Save their complete output with the test date.
Copy the full GUID and friendly name exactly as Windows reports them.
powercfg /getactiveschemeAn asterisk marks the current scheme. Check whether Ultimate Performance or an existing duplicate is already present before creating another.
powercfg /listIf the output includes Standby (S0 Low Power Idle), the PC uses Modern Standby. Microsoft says those devices allow Balanced or Balanced-derived plans.
powercfg /availablesleepstatesWrite down Windows build, CPU/GPU, cooling mode, power source, Luczystrap version, Roblox version, experience, server, graphics level, FPS cap, background apps, and room temperature if available.
Use the same scene and duration. Record median FPS or frame time, slow frames, CPU temperature, effective clocks, fan noise, and power draw or battery change.
05 / Enable and verify
Use Luczystrap first. The manual commands are a transparent fallback when you intentionally choose to create the scheme yourself.
Do not combine changes. Leave High Priority, core parking, network tweaks, external “optimizer” scripts, and FastFlag packs unchanged during this test.
Open Configure Settings → Windows Tweaks → Enable Ultimate Performance. Accept elevation only when Windows clearly identifies the expected Luczystrap or Windows action.
Run the read command again. If Windows still reports the original scheme, classify the tweak as not applied; do not infer success from the toggle or toast.
powercfg /getactiveschemeIf you intentionally use the Microsoft command, run it in an elevated Terminal and copy the new GUID printed in the output. Do not run it repeatedly.
powercfg /duplicatescheme e9a42b02-d5df-448d-aa00-03f14749eb61Replace the placeholder with the new GUID printed by the previous command. Then verify it independently.
powercfg /setactive NEW_GUID_FROM_OUTPUT
powercfg /getactiveschemeIf Windows rejects the command, policy blocks it, or the device supports only Modern Standby plans, stop. Do not use registry hacks, imported power files, or unknown administrator scripts to force availability.
06 / Matched test
Complete the six passes under the same workload. The counter is a local checklist; it stores nothing.
Median, 1% low, or p95/p99 frame time in the same CPU-sensitive scene.
CPU temperature, effective clocks, fan noise, wall power, or battery drain.
Server, scene, camera, duration, graphics, cap, background load, and power source.
Run all baseline passes before changing the active power scheme.
07 / Exact undo
Do not assume switching Luczystrap off restores Windows. Use the baseline GUID, then verify the active scheme.
Rollback passes when: Windows reports the original GUID, the Power Options UI agrees, and a final Roblox pass behaves like the baseline.
Exit Roblox and any monitoring tools that are no longer needed. Keep the results and both scheme GUIDs.
Replace the placeholder with the complete GUID captured before the test.
powercfg /setactive ORIGINAL_GUID_FROM_BASELINEDo not stop at a success message. Compare the returned GUID byte for byte with the baseline.
powercfg /getactivescheme
powercfg /listTurn the Luczystrap option off so the UI no longer requests the test state. Then re-check Windows because the old implementation did not restore it.
Delete a duplicate only if it is inactive, you created it during this test, you recorded its exact GUID, and it contains no customization you need. Keeping an inactive plan is safer than deleting the wrong GUID.
08 / Claim filter
Ultimate Performance is a Windows power-policy choice. It is not a universal Roblox optimization layer.
A GPU-bound scene, game-code stall, network wait, or FPS cap may not respond to a power-plan change.
The plan changes power-management preferences. Firmware, silicon limits, cooling, and drivers still control achievable clocks.
Server region, ISP routing, Wi-Fi, game load, and physical distance remain separate latency factors.
Graphics settings, ClientAppSettings.json, Roblox global settings, and the local allowlist are separate layers.
More aggressive power behavior may increase heat or power and can make a cooling-limited system worse.
Modern Standby, managed devices, efficient modern CPUs, and already-tuned OEM systems may need another path—or no change.
09 / Test record
“It felt smoother” does not identify the plan, workload, benefit, or cost.
Remove: Windows username, serial numbers, private server links, account IDs, and unrelated system details.
Luczystrap version: Windows edition and build: Desktop / laptop / handheld: Modern Standby (S0 Low Power Idle): yes / no CPU / GPU / RAM: Cooling mode and power source: Original active scheme name and GUID: Ultimate scheme name and GUID: Enabled through Luczystrap or powercfg: Activation verified by getactivescheme: yes / no Roblox version: Experience / server region / scene: Graphics level / FPS cap: Pass duration: Baseline runs (median / 1% low / frame time): Ultimate runs (median / 1% low / frame time): Baseline temperature / clocks / power: Ultimate temperature / clocks / power: Noise, stability, or responsiveness change: Original GUID restored and verified: yes / no Conclusion: keep / revert / no measurable benefit
10 / FAQ
Historical public 1.3 code attempted to duplicate the Windows Ultimate Performance scheme and activate it. This is a system-wide power-plan change; it does not edit Roblox graphics or overclock hardware.
No increase is guaranteed. It targets power-management latency, so any effect depends on workload, hardware, firmware, cooling, and the actual bottleneck. Use three matched passes per state.
Record the active plan GUID, open Configure Settings → Windows Tweaks, enable only Ultimate Performance, then run powercfg /getactivescheme. Windows—not the toggle—confirms activation.
The plan may not exist, a policy may restrict it, or the device may use Modern Standby. Microsoft says Modern Standby devices allow Balanced or Balanced-derived plans only.
Not as a default recommendation. Microsoft introduced the plan with an explicit power-consumption cost and originally excluded battery-powered systems. Prefer a plugged-in test or the supported Windows Best performance power mode.
Run powercfg /getactivescheme and compare its GUID and friendly name with your expected test plan. A Luczystrap setting, toast, or historical log is not enough.
Run powercfg /setactive ORIGINAL_GUID with the exact GUID saved before the test. Verify it with /getactivescheme, then align the Luczystrap toggle.
Historical 1.3 code did not perform any Windows action on false. Current 1.4.9 source is closed, so restore and verify the recorded Windows GUID instead of assuming the UI reverted it.
11 / Primary evidence
Evidence boundary: release notes and videos prove the feature name and visible UI. Historical tag 1.3 proves the older command sequence. Only the current Windows state proves what happened on your PC.