diff --git a/frontend/src/components/editor/EditorToolbar.tsx b/frontend/src/components/editor/EditorToolbar.tsx
index ef45c420..604a7893 100644
--- a/frontend/src/components/editor/EditorToolbar.tsx
+++ b/frontend/src/components/editor/EditorToolbar.tsx
@@ -24,7 +24,7 @@ import { reportRunEvent } from '../../services/metricsService';
 import { useProjectStore } from '../../store/useProjectStore';
 import { LibraryManagerModal } from '../simulator/LibraryManagerModal';
 import { InstallLibrariesModal } from '../simulator/InstallLibrariesModal';
-import { parseCompileResult } from '../../utils/compilationLogger';
+import { parseCompileResult, isNoiseBuildLine } from '../../utils/compilationLogger';
 import type { CompilationLog, CompileTarget } from '../../utils/compilationLogger';
 import { exportToWokwiZip } from '../../utils/wokwiZip';
 import { importProjectFile, PROJECT_FILE_ACCEPT } from '../../utils/importProject';
@@ -551,7 +551,9 @@ export const EditorToolbar = ({
           if (stdout.length <= lastStreamedLen) return;
           const delta = stdout.slice(lastStreamedLen);
           lastStreamedLen = stdout.length;
-          const newLines = delta.split('\n').filter((s) => s.trim());
+          const newLines = delta
+            .split('\n')
+            .filter((s) => s.trim() && !isNoiseBuildLine(s));
           if (!newLines.length) return;
           const now = new Date();
           setCompileLogs((prev: CompilationLog[]) => [
@@ -581,8 +583,9 @@ export const EditorToolbar = ({
       // After the build settles, append the structured analysis on top of
       // the live stream — parseCompileResult highlights FAILED blocks and
       // tags compiler errors with type='error', which the console uses for
-      // colour + the auto-switch-to-errors filter.
-      const resultLogs = parseCompileResult(result, boardLabel, boardTarget);
+      // colour + the auto-switch-to-errors filter. streamedLive tells it not
+      // to reprint the stdout the stream above already showed.
+      const resultLogs = parseCompileResult(result, boardLabel, boardTarget, lastStreamedLen > 0);
       setCompileLogs((prev: CompilationLog[]) => [...prev, ...resultLogs]);
 
       if (result.success) {
@@ -1057,7 +1060,9 @@ export const EditorToolbar = ({
             if (stdout.length <= lastStreamedLen) return;
             const delta = stdout.slice(lastStreamedLen);
             lastStreamedLen = stdout.length;
-            const newLines = delta.split('\n').filter((s) => s.trim());
+            const newLines = delta
+            .split('\n')
+            .filter((s) => s.trim() && !isNoiseBuildLine(s));
             if (!newLines.length) return;
             const now = new Date();
             setCompileLogs((prev: CompilationLog[]) => [
@@ -1074,7 +1079,7 @@ export const EditorToolbar = ({
           { boardOptions: board.boardOptions, spiffsFiles: board.spiffsFiles, libraries: board.libraries?.length ? board.libraries : null, language: board.languageMode === 'espidf' ? 'espidf' : undefined },
         );
 
-        const resultLogs = parseCompileResult(result, label, boardTarget);
+        const resultLogs = parseCompileResult(result, label, boardTarget, lastStreamedLen > 0);
         setCompileLogs((prev: CompilationLog[]) => [...prev, ...resultLogs]);
 
         if (result.success) {
diff --git a/frontend/src/utils/compilationLogger.ts b/frontend/src/utils/compilationLogger.ts
index 0a3cf92a..6b169b07 100644
--- a/frontend/src/utils/compilationLogger.ts
+++ b/frontend/src/utils/compilationLogger.ts
@@ -21,10 +21,40 @@ export interface CompilationLog {
   target?: CompileTarget;
 }
 
+/** Build-system chatter with no signal for the user: CMake configure status,
+ *  git-metadata probes inside the build container (the tree is a synthesized
+ *  project, never a git repo — those "fatal:" lines are expected), IDF
+ *  component-manager dependency solving, Python env checks. The full log is
+ *  still available server-side; the console only drops these lines. */
+const NOISE_LINE_PATTERNS: RegExp[] = [
+  /^-- /, // CMake configure status lines
+  /^fatal: not a git repository/,
+  /^Stopping at filesystem boundary/,
+  /^\.*NOTE: /, // IDF component manager (incl. leading progress dots)
+  /^warning: unknown kconfig symbol/,
+  /^Loading defaults file /,
+  /^Constraint file: /,
+  /^Requirement files:/,
+  /^- \/.*requirements[^ ]*\.txt$/,
+  /^Python being checked: /,
+  /^Python requirements are satisfied\.?$/,
+  /Project commit: HEAD-HASH-NOTFOUND/,
+];
+
+export function isNoiseBuildLine(line: string): boolean {
+  const stripped = line.trim();
+  return NOISE_LINE_PATTERNS.some((re) => re.test(stripped));
+}
+
 export function parseCompileResult(
   result: CompileResult,
   board: string,
   target?: CompileTarget,
+  /** True when the caller already streamed the live cmake+ninja output into
+   *  the console while the build ran. Skips re-printing result.stdout on
+   *  success, and on failure re-emits only the error/warning lines (for the
+   *  red/yellow highlighting the plain live stream lacked). */
+  streamedLive = false,
 ): CompilationLog[] {
   const logs: CompilationLog[] = [];
   const now = new Date();
@@ -40,8 +70,10 @@ export function parseCompileResult(
     }
   }
 
-  // stdout — for ESP-IDF/ninja builds, compiler errors appear here
-  if (result.stdout) {
+  // stdout — for ESP-IDF/ninja builds, compiler errors appear here.
+  // When the live stream already showed it, a successful build has nothing
+  // left to say here (re-printing would duplicate the whole log).
+  if (result.stdout && !(streamedLive && result.success)) {
     let inFailedBlock = false;
     for (const line of result.stdout.split('\n')) {
       if (!line.trim()) continue;
@@ -71,6 +103,8 @@ export function parseCompileResult(
       } else {
         type = 'info';
       }
+      if (type === 'info' && (streamedLive || isNoiseBuildLine(stripped))) continue;
+      if (type === 'warning' && isNoiseBuildLine(stripped)) continue;
       logs.push({ timestamp: now, type, message: line });
     }
   }
@@ -79,6 +113,7 @@ export function parseCompileResult(
   if (result.stderr) {
     for (const line of result.stderr.split('\n')) {
       if (!line.trim()) continue;
+      if (isNoiseBuildLine(line)) continue;
       let type: CompilationLog['type'] = 'error';
       const lower = line.toLowerCase();
       if (lower.includes('warning:') || lower.includes('warn ')) {
@@ -96,6 +131,9 @@ export function parseCompileResult(
       ) {
         type = 'info';
       }
+      // Live-streamed builds already showed the chatter; only re-emit lines
+      // that gain something from re-classification (red/yellow markers).
+      if (type === 'info' && streamedLive) continue;
       logs.push({ timestamp: now, type, message: line });
     }
   }