Exact local keys in the current official announcement.
4 geometry · 13 rendering · 1 UIVersion × policy compatibility · checked 03 Aug 2026
Luczystrap can still write FastFlags. Roblox decides which local values the Player accepts.
The Roblox allowlist arrived before Luczystrap 1.2, 1.4 and 1.4.9. Release notes prove which controls Luczystrap shipped; they do not override the later client gate or turn IXP into an approved replacement.
Current answer: use only the 18 exact keys in Roblox’s live
ClientAppSettings.json allowlist, test one at a time, and leave IXP unused. Unlisted JSON entries are ignored. Memory manipulation and cache-based alternatives have separate, stronger warnings.Two independent clocksProduct × platform
Luczystrap
1.2Presets
1.4IXP added
1.4.9IXP managed
Roblox
SEP 2025Allowlist
DEC 2025IXP warning
APR 2026No expansion
Current compatibility output03 Aug 2026
Standard JSON18 keys eligible
Unlisted JSONIgnored
IXP routeLeave unused
Stored ≠ recognized ≠ effectiveTest one layer
01 / Current snapshot
The compatibility boundary is narrower than the editor.
A value can remain visible in Luczystrap and valid JSON while the current Player silently ignores it.
1.2, 1.4, 1.4.1 and 1.4.9 contain FastFlag or IXP claims.
Historical product evidenceAllowlist, JSON clarification, IXP, memory, GBS and later direction.
Different methods, different rulesStandard JSON with one currently allowlisted key.
Baseline → change → rollback02 / Version checkpoint explorer
Read each release through the policy already in force.
Select a checkpoint to separate the historical Luczystrap claim, the platform state on that date and the correct current interpretation.
Release or current state
Presets after the allowlistVersion checkpoint
Version 1.2 shipped named presets without publishing their exact keys.
The notes introduced mesh distance, grass control, Potato, Low and Ultra presets, plus a hardware score. Roblox had already announced that only listed ClientAppSettings keys would be recognized.
Evidence supports
The controls and preset names were released on October 22, 2025.
Current reading
Audit every key inside a legacy preset. A preset name cannot prove that all its values remain recognized or effective.
03 / Dual-source timeline
The policy story and the release story must stay in order.
Later Roblox clarifications change today’s decision. They must not be rewritten as if they appeared in Luczystrap’s original release notes.
Roblox policy
Local FastFlag allowlist announced
Only explicitly listed keys in ClientAppSettings.json are recognized; other entries are ignored.
Roblox clarification
Ignored JSON is separated from other methods
Unlisted JSON entries receive no effect. Attempting to set flags another way is described as subject to consequences.
Luczystrap 1.2
Presets, mesh and grass controls ship
The release presents Potato, Low and Ultra presets after the allowlist, but does not publish their complete key inventory.
Luczystrap 1.4
IXP Editor added
IXP appears in the FastFlags section; the release also says IXP and FastFlag data are set read-only.
Luczystrap 1.4.1
IXP writes gain batch helpers and retries
The hotfix documents rename, remove and set helpers plus read-only reapplication. Technical capability is not a platform verdict.
Luczystrap 1.4.9
IXP management remains in Fastflags
The current release adds an option to let Luczystrap manage IXP and changes the warning wording.
Roblox Staff
Luczystrap IXP is named directly
Bitdancer describes using the Luczystrap IXP Editor as cache poisoning that might lead to consequences.
Roblox Staff
Memory manipulation receives the strongest label
Programs manipulating client memory are categorized as cheats and exploits with standard enforcement procedures.
Roblox Staff
GlobalBasicSettings is treated separately
Modified GlobalBasicSettings_13.xml is not described as a ban reason, though future restrictions remain possible.
Current audit
The original 18-key list still controls this page
The official post still contains 4 geometry, 13 rendering and 1 UI key; the thread’s latest contribution is dated July 28.
April 2026 direction: after a requested rendering flag was discussed, Bitdancer said it had been vetoed internally because the aim was to remove FastFlags rather than add more. Do not build a compatibility promise around expected allowlist expansion.
04 / Configuration-route matrix
The file, method and destination determine the rule.
“FastFlag” is not one universal compatibility state. Use the row matching the actual path used to change Roblox.
| Configuration route | Current platform behavior | Luczystrap interpretation | Action |
|---|---|---|---|
Allowlisted key in ClientAppSettings.jsonEligible | The Player may recognize the exact key and valid value. | The standard editor can write it, but storage alone does not prove a visible effect. | Test one key against a control, then remove it and confirm baseline. |
Unlisted key in ClientAppSettings.jsonIgnored | Roblox says the Player ignores it and takes no further action for the attempted JSON override. | The value may remain visible in Luczystrap or the file while doing nothing. | Remove stale entries instead of stacking more flags. |
| Luczystrap IXP / experiment cacheAvoid | Roblox Staff specifically described this route as cache poisoning that might lead to consequences. | Feature presence in 1.4–1.4.9 is historical capability, not current compatibility. | Leave IXP unused; do not migrate its state or seek a replacement bypass. |
| Memory manipulation or external setterExploit boundary | Roblox Staff categorizes programs manipulating client memory as cheats and exploits. | This is outside the ordinary Luczystrap JSON editor compatibility route. | Do not use it. No bypass instructions are provided. |
GlobalBasicSettings_13.xmlSeparate | Staff said modifications were not a ban reason in January 2026; future restriction remains possible. | This is a Roblox settings file, not proof that a FastFlag was allowlisted. | Prefer current in-game settings; verify the actual value and re-check policy. |
| Roblox Studio flagsNot restricted | The Player’s local allowlist announcement explicitly excludes Studio. | A Studio result cannot be transferred to Roblox Player behavior. | Keep Studio and Player test records separate. |
05 / Four proof states
Saved is not recognized. Recognized is not effective.
FastFlag claims fail when these four checkpoints are collapsed into a single “works” badge.
Stored
Luczystrap or another editor writes syntactically valid JSON to the expected file.
File evidence onlyRecognized
The exact key is on Roblox’s current allowlist and the Player accepts the value type.
Platform eligibilityEffective
A controlled current test produces the expected observable change and repeats.
Runtime evidenceAppropriate
The method stays inside the intended local configuration route and current policy boundary.
Method decisionCompatibility rule: publish “works” only when the same current Player passes all four checkpoints. A green save notification proves checkpoint 01—not checkpoints 02 through 04.
06 / Current allowlist scope
Use the live registry for names—not this timeline.
This page owns version and policy chronology. The dedicated Allowlist page owns all 18 exact keys, search, category filters and copy-safe spelling.
Roblox can change the list without warning. A screenshot, preset bundle or cached article is weaker than the live official announcement.
Check an exact key →Geometry
Four CSG level-of-detail switching distances.
Rendering
Texture quality, graphics API, grass, voxelizer and related rendering controls.
User interface
Grass movement reduced-motion factor.
07 / Reproducible compatibility test
Prove one key, then prove its removal.
This procedure tests current effect without turning a saved file, preset name or FPS screenshot into a universal claim.
Stop rule: do not enable IXP, an external setter, memory manipulation or a bulk flag pack to make a failed key appear effective.
One-key run sheetBaseline → change → rollback
01
Record both versionsLuczystrap 1.4.9, Roblox Player version/channel, Windows build and UTC date.
Identity02
Back up the current JSONPreserve
RecoverClientAppSettings.json outside the Roblox version folder.03
Prove the stock baselineStart the same experience twice with the candidate key absent and record one observable condition.
Control04
Add one exact allowlisted keyVerify spelling and value type against the live list; do not import a bundle.
Change05
Restart and repeat twiceUse the same scene, account, graphics settings and measurement method.
Observe06
Remove the key and confirm rollbackThe baseline should return. If not, another changed layer owns the result.
VerifyA valid record names the exact key, value, Player version, scene, baseline, changed result and rollback result. “Potato preset gave more FPS” is not enough to reproduce the claim.
08 / Version decisions
Do not downgrade to recover a retired flag.
The allowlist is enforced by the current Roblox Player, not by the age of Luczystrap. An older bootstrapper does not restore the old client rule.
Use 1.4.9 and standard JSON only.
Begin with the current official release, no imported bundle and one key from the live allowlist.
Current app · current list · one testAudit keys instead of trusting the preset name.
Potato, Low and Ultra describe historical intent. Export the JSON, compare every key with the live registry and remove ignored entries.
Preset label is not compatibility proofDo not carry it forward.
Leave IXP disabled, exclude its cache state from profiles and migrations, and do not replace it with memory or external setters.
Feature availability ≠ permission09 / Continue by intent
Open the page that owns the next decision.
This timeline does not duplicate the key registry, editor procedure, policy explanation, reset steps or broader Roblox compatibility test.
Exact names
Current 18-key Allowlist
Search, filter and copy every currently listed local key.
Check a key →Standard configurationFastFlag Editor
Write one reviewed value through the ordinary ClientAppSettings route.
Use the editor →Controlled evidenceTest one FastFlag
Build a repeatable baseline, change and rollback result.
Open the test protocol →Method boundaryIXP vs FastFlags
Separate standard JSON from experiment-cache modification.
Understand the difference →Account policyRoblox Policy Guide
Launcher presence, configuration methods and enforcement are separate questions.
Review policy →All compatibility layersCompatibility Matrix
Windows, Player, flags, IXP, mods, plugins and test boundaries.
Return to compatibility →RollbackReset FastFlags
Back up, remove local overrides and confirm the Player baseline.
Restore defaults →Historical originVersion 1.4 record
Profiles, Plugin SDK, IXP introduction and later policy context.
Read release history →10 / FAQ
Luczystrap FastFlag compatibility questions.
Do Luczystrap FastFlags still work?
Some can. Roblox currently recognizes only the 18 local keys in its official allowlist. A listed key is eligible for recognition, but its actual effect still needs a current controlled test.
Which Luczystrap FastFlags work after the Roblox allowlist?
Only exact keys on Roblox’s current list are eligible through ClientAppSettings.json. The checked list contains four geometry, thirteen rendering and one user-interface key. Use the live registry rather than a preset name.
What happened to old Luczystrap FastFlag presets?
A preset can still be displayed or written, but Roblox ignores any included key outside the current allowlist. Audit each exact key and do not assume Potato, Low or Ultra remains fully effective.
Does Luczystrap 1.4.9 bypass the FastFlag allowlist?
No. The ordinary ClientAppSettings.json editor cannot bypass the Roblox allowlist. Writing a non-listed key does not make the Player recognize it.
Is Luczystrap IXP compatible with current Roblox policy?
Do not treat it as a compatible or low-risk route. Roblox Staff specifically described using Luczystrap’s IXP Editor as cache poisoning that might lead to consequences. Leave IXP unused.
Are non-allowlisted flags bannable in ClientAppSettings.json?
Roblox’s official FAQ says unlisted JSON entries are ignored and no further action is taken for attempting to use them there. Staff separately warned that other methods of setting flags can have consequences.
Can I change the Roblox framerate cap without a FastFlag?
Roblox exposes a framerate setting in GlobalBasicSettings_13.xml and current in-game settings. Staff said modified GBS files were not a ban reason in January 2026, while noting future restrictions are possible.
Does Roblox Studio use the Player FastFlag allowlist?
No. Roblox’s official announcement says Roblox Studio FastFlags are not restricted by the local Player allowlist.
How do I test one FastFlag with Luczystrap today?
Record both versions, prove a stock baseline, choose one exact allowlisted key, restart the Player, measure one expected effect, remove the key and confirm the baseline returns.
11 / Primary evidence
Release claims and platform rules, kept separate.
Method: I read the official Luczystrap release records and Roblox thread JSON through its July 28, 2026 last post. The original allowlist post still contains 18 entries. Current effect remains a test question, not a conclusion copied from release notes.
01Luczystrap 1.2 releaseMesh, grass, named presets and Smart Benchmark claims.↗02Luczystrap 1.4 releaseIXP Editor introduction and read-only handling.↗03Luczystrap 1.4.1 releaseIXP batch helpers, retries and file-write handling.↗04Luczystrap 1.4.9 releaseCurrent IXP management option and warning changes.↗05Official FastFlag Allowlist18 keys, ignored-entry behavior, Studio and Bloxstrap FAQ.↗06JSON vs other methodsIgnored file entries and the consequence boundary.↗07Luczystrap IXP clarificationDirect cache-poisoning warning from Bitdancer.↗08Memory-manipulation boundarySeparate treatment of loopholes, cheats and exploits.↗09GlobalBasicSettings clarificationJanuary 2026 current-file and future-restriction statement.↗10April 2026 directionRequested addition veto and stated aim to remove flags.↗