diff --git a/services/core/java/com/android/server/pm/BackgroundDexOptService.java b/services/core/java/com/android/server/pm/BackgroundDexOptService.java
index 0a254029a8f4b..ee02a9954a5ad 100644
--- a/services/core/java/com/android/server/pm/BackgroundDexOptService.java
+++ b/services/core/java/com/android/server/pm/BackgroundDexOptService.java
@@ -144,11 +144,18 @@ public class BackgroundDexOptService extends JobService {
                     if (DEBUG_DEXOPT) {
                         Log.i(TAG, "Updating package " + pkg);
                     }
+
                     // Update package if needed. Note that there can be no race between concurrent
                     // jobs because PackageDexOptimizer.performDexOpt is synchronized.
+
+                    // checkProfiles is false to avoid merging profiles during boot which
+                    // might interfere with background compilation (b/28612421).
+                    // Unfortunately this will also means that "pm.dexopt.boot=speed-profile" will
+                    // behave differently than "pm.dexopt.bg-dexopt=speed-profile" but that's a
+                    // trade-off worth doing to save boot time work.
                     pm.performDexOpt(pkg,
                             /* instruction set */ null,
-                            /* checkProfiles */ true,
+                            /* checkProfiles */ false,
                             PackageManagerService.REASON_BOOT,
                             /* force */ false);
                 }
diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index 96bfe4a27a0a1..d268e8543f6b1 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -7196,9 +7196,14 @@ public class PackageManagerService extends IPackageManager.Stub {
                 }
             }
 
+            // checkProfiles is false to avoid merging profiles during boot which
+            // might interfere with background compilation (b/28612421).
+            // Unfortunately this will also means that "pm.dexopt.boot=speed-profile" will
+            // behave differently than "pm.dexopt.bg-dexopt=speed-profile" but that's a
+            // trade-off worth doing to save boot time work.
             int dexOptStatus = performDexOptTraced(pkg.packageName,
                     null /* instructionSet */,
-                    true /* checkProfiles */,
+                    false /* checkProfiles */,
                     getCompilerFilterForReason(causeFirstBoot ? REASON_FIRST_BOOT : REASON_BOOT),
                     false /* force */);
             switch (dexOptStatus) {