FLauncher 12.2.0 — Optimization Suite Phase 2

FLauncher 12.2.0 — Optimization Suite, Phase 2

Builds on 12.1.0's Performance settings. Still all opt-in.

Discrete GPU forcing (Windows)

"Use discrete GPU" now registers your exact javaw.exe with Windows as a high-performance-GPU app (Settings > Display > Graphics) before the game starts. On dual-GPU laptops that were rendering Minecraft on the integrated GPU this is the single biggest win available; on desktops it does nothing. Turning the toggle off removes the entry — but only if FLauncher wrote it; a preference you set yourself in Windows Settings is never touched.

Old Java 8 safety guard

The tuned GC flags don't exist on Java 8 below update 40, and such a JVM would refuse to start with them. The generator now detects that and emits nothing instead of failing your launch.

Smart-heap visibility

• The launch log states when memory was sized automatically.
• The Java settings memory box shows a notice while automatic sizing is active, so the ignored spinboxes don't mislead.

From 12.1.0 (if you're jumping straight here)

Auto-optimized JVM flags (the 1.8.9 GC-stutter fix), automatic memory sizing, and game process priority — see the 12.1.0 notes.

FLauncher 12.1.0 — Optimization Suite

FLauncher 12.1.0 — Optimization Suite

New Performance section in Settings → Minecraft (and per-instance under Settings, with the override checkbox). Everything is off by default — if you don't touch it, launches are identical to 12.0.4.

Auto-optimized JVM flags

Tuned garbage-collector flags chosen for your Java version and RAM:

• Balanced (G1) — recommended for everyone. On Java 8 / MC 1.8.9 this replaces the default collector responsible for the classic periodic stutter with short, predictable pauses.
• Low latency (ZGC) — for Java 21+ with a 6 GB+ heap and 16 GB+ RAM; silently falls back to Balanced otherwise.

These target stutter and frame-time consistency, not average FPS. Anything you set yourself in the Java arguments box overrides the generated flags.

Automatic memory sizing

Picks -Xmx from your installed RAM and the game's Java generation (2–3 GB for 1.8.9-class, 4 GB for modern MC, never more than half your RAM). With RAM to spare it locks the heap size at startup to eliminate resize hitches. A per-instance Memory override always wins.

Game process priority (Windows)

Optionally run the game at Above normal (recommended) or High priority so background apps steal less CPU. Not applied when a wrapper command is set.

Notes

• Very old Java 8 builds (below update 40) may reject the tuned flags and exit at startup with a clear message in the log — disable the toggle if that happens; a guard ships in the next release.
• Auto-update from 12.0.x works as usual.

FLauncher 12.0.4

FLauncher 12.0.4 — Account Privacy

This release adds a set of features for running multiple Minecraft accounts
without them being linkable to the same person. Everything below is off or
inert until you configure it — normal instances are unaffected.

📖 Full setup guide: ACCOUNT_PRIVACY_GUIDE.md

New

• Lock an instance to one account. A bound instance now refuses to launch
  if its account is missing or broken, instead of silently falling back to your
  default account (which used to quietly expose the wrong account).
• Per-instance proxy. Give each instance its own outgoing IP (SOCKS5/HTTP,
  with optional auth). The proxy is applied to the game and exposed to mods as the
  FLAUNCHER_PROXY environment variable so your in-game proxy mod can route the
  server connection.
• Pre-launch proxy check. Before launching a proxied instance, FLauncher
  verifies the proxy is reachable and actually changes your IP. If not, it warns
  before you connect on your real IP.
• Per-instance game language. Override an instance's locale (e.g. de_DE) so
  its client language can match its proxy region.
• Linkability Report. Scans your instances and flags anything that links two
  accounts — a shared account, a shared proxy, or an unprotected instance.
• Stream-safe mode. Masks account usernames in the UI for streaming/screen-share.

All settings and kill switches live under Settings → Launcher → Account Privacy.

Notes

• In-game server-connection routing is handled by your proxy mod via
  FLAUNCHER_PROXY; the launcher routes the game's web traffic and hands off the
  proxy. See the guide.
• Every new safeguard has an off switch and defaults to safe. If something blocks
  you, the kill switches are all in one place.

Install

Windows: download FLauncher-Windows-MSVC-Setup-12.0.4.exe below. Installed
copies on 12.0.2+ (MSVC) will auto-update.

FLauncher 12.0.3

Theme: use FLauncher purple as the accent color

Recolor the selection/highlight and link accents in the dark and light
themes from green/blue to the FLauncher purple. Bump to 12.0.3.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

FLauncher 12.0.2

Bump version to 12.0.2

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>