diff --git a/dev/bots/analyze.dart b/dev/bots/analyze.dart
index dc98d756ab..35865ea908 100644
--- a/dev/bots/analyze.dart
+++ b/dev/bots/analyze.dart
@@ -610,7 +610,7 @@ class Hash256 {
   }
 
   @override
-  int get hashCode => Object.hash(a, b, c, d);
+  int get hashCode => a ^ b ^ c ^ d;
 }
 
 // DO NOT ADD ANY ENTRIES TO THIS LIST.
diff --git a/dev/devicelab/lib/framework/running_processes.dart b/dev/devicelab/lib/framework/running_processes.dart
index b07f1c17dd..a96254f594 100644
--- a/dev/devicelab/lib/framework/running_processes.dart
+++ b/dev/devicelab/lib/framework/running_processes.dart
@@ -28,7 +28,20 @@ class RunningProcessInfo {
   }
 
   @override
-  int get hashCode => Object.hash(pid, commandLine, creationDate);
+  int get hashCode {
+    // TODO(dnfield): Replace this when Object.hashValues lands, https://github.com/dart-lang/sdk/issues/11617
+    int hash = 17;
+    if (pid != null) {
+      hash = hash * 23 + pid.hashCode;
+    }
+    if (commandLine != null) {
+      hash = hash * 23 + commandLine.hashCode;
+    }
+    if (creationDate != null) {
+      hash = hash * 23 + creationDate.hashCode;
+    }
+    return hash;
+  }
 
   @override
   String toString() {
diff --git a/dev/devicelab/test/adb_test.dart b/dev/devicelab/test/adb_test.dart
index bd9cb6a440..018ce409ef 100644
--- a/dev/devicelab/test/adb_test.dart
+++ b/dev/devicelab/test/adb_test.dart
@@ -166,14 +166,15 @@ class CommandArgs {
   }
 
   @override
-  int get hashCode {
-    return Object.hash(
-      command,
-      Object.hashAll(arguments ?? const <String>[]),
-      Object.hashAllUnordered(environment?.keys ?? const <String>[]),
-      Object.hashAllUnordered(environment?.values ?? const <String>[]),
-    );
-  }
+  int get hashCode => 17 * (17 * command.hashCode + _hashArguments) + _hashEnvironment;
+
+  int get _hashArguments => arguments != null
+    ? const ListEquality<String>().hash(arguments)
+    : null.hashCode;
+
+  int get _hashEnvironment => environment != null
+    ? const MapEquality<String, String>().hash(environment)
+    : null.hashCode;
 }
 
 class FakeDevice extends AndroidDevice {
diff --git a/dev/integration_tests/android_semantics_testing/lib/src/common.dart b/dev/integration_tests/android_semantics_testing/lib/src/common.dart
index b01c2fc8e5..8879850835 100644
--- a/dev/integration_tests/android_semantics_testing/lib/src/common.dart
+++ b/dev/integration_tests/android_semantics_testing/lib/src/common.dart
@@ -183,7 +183,8 @@ class Rect {
   final double bottom;
 
   @override
-  int get hashCode => Object.hash(top, left, right, bottom);
+  int get hashCode =>
+      top.hashCode ^ left.hashCode ^ right.hashCode ^ bottom.hashCode;
 
   @override
   bool operator ==(Object other) {
@@ -215,7 +216,7 @@ class Size {
   final double height;
 
   @override
-  int get hashCode => Object.hash(width, height);
+  int get hashCode => width.hashCode ^ height.hashCode;
 
   @override
   bool operator ==(Object other) {
diff --git a/dev/tools/localization/localizations_utils.dart b/dev/tools/localization/localizations_utils.dart
index e3373dce2c..12097498c9 100644
--- a/dev/tools/localization/localizations_utils.dart
+++ b/dev/tools/localization/localizations_utils.dart
@@ -128,7 +128,9 @@ class LocaleInfo implements Comparable<LocaleInfo> {
   }
 
   @override
-  int get hashCode => originalString.hashCode;
+  int get hashCode {
+    return originalString.hashCode;
+  }
 
   @override
   String toString() {
diff --git a/dev/tools/vitool/lib/vitool.dart b/dev/tools/vitool/lib/vitool.dart
index e60bb71dbb..0f0f4bc2c6 100644
--- a/dev/tools/vitool/lib/vitool.dart
+++ b/dev/tools/vitool/lib/vitool.dart
@@ -274,7 +274,7 @@ class FrameData {
   }
 
   @override
-  int get hashCode => Object.hash(size, Object.hashAll(paths));
+  int get hashCode => size.hashCode ^ paths.hashCode;
 
   @override
   String toString() {
@@ -328,7 +328,7 @@ class SvgPath {
   }
 
   @override
-  int get hashCode => Object.hash(id, Object.hashAll(commands), opacity);
+  int get hashCode => id.hashCode ^ commands.hashCode ^ opacity.hashCode;
 
   @override
   String toString() {
@@ -377,7 +377,7 @@ class SvgPathCommand {
   }
 
   @override
-  int get hashCode => Object.hash(type, Object.hashAll(points));
+  int get hashCode => type.hashCode ^ points.hashCode;
 
   @override
   String toString() {
diff --git a/packages/flutter/lib/src/material/about.dart b/packages/flutter/lib/src/material/about.dart
index 3129e97ebd..f8cbcba0c2 100644
--- a/packages/flutter/lib/src/material/about.dart
+++ b/packages/flutter/lib/src/material/about.dart
@@ -798,7 +798,7 @@ class _DetailArguments {
   }
 
   @override
-  int get hashCode => hashValues(packageName, hashList(licenseEntries));
+  int get hashCode => packageName.hashCode; // Good enough.
 }
 
 class _PackageLicensePage extends StatefulWidget {
diff --git a/packages/flutter_driver/lib/src/driver/driver.dart b/packages/flutter_driver/lib/src/driver/driver.dart
index 197352068c..95763da162 100644
--- a/packages/flutter_driver/lib/src/driver/driver.dart
+++ b/packages/flutter_driver/lib/src/driver/driver.dart
@@ -814,5 +814,5 @@ class DriverOffset {
   }
 
   @override
-  int get hashCode => Object.hash(dx, dy);
+  int get hashCode => dx.hashCode ^ dy.hashCode;
 }
diff --git a/packages/flutter_tools/lib/src/asset.dart b/packages/flutter_tools/lib/src/asset.dart
index 09717f7c1d..4d88be9703 100644
--- a/packages/flutter_tools/lib/src/asset.dart
+++ b/packages/flutter_tools/lib/src/asset.dart
@@ -911,7 +911,11 @@ class _Asset {
   }
 
   @override
-  int get hashCode => Object.hash(baseDir, relativeUri, entryUri.hashCode);
+  int get hashCode {
+    return baseDir.hashCode
+        ^ relativeUri.hashCode
+        ^ entryUri.hashCode;
+  }
 }
 
 // Given an assets directory like this:
diff --git a/packages/flutter_tools/lib/src/base/fingerprint.dart b/packages/flutter_tools/lib/src/base/fingerprint.dart
index 194f857ea1..ad8a8da046 100644
--- a/packages/flutter_tools/lib/src/base/fingerprint.dart
+++ b/packages/flutter_tools/lib/src/base/fingerprint.dart
@@ -128,7 +128,10 @@ class Fingerprint {
   }
 
   @override
-  int get hashCode => Object.hash(Object.hashAllUnordered(_checksums.keys), Object.hashAllUnordered(_checksums.values));
+  // Ignore map entries here to avoid becoming inconsistent with equals
+  // due to differences in map entry order. This is a really bad hash
+  // function and should eventually be deprecated and removed.
+  int get hashCode => _checksums.length.hashCode;
 
   @override
   String toString() => '{checksums: $_checksums}';
diff --git a/packages/flutter_tools/lib/src/base/version.dart b/packages/flutter_tools/lib/src/base/version.dart
index 89895995f7..4192f26175 100644
--- a/packages/flutter_tools/lib/src/base/version.dart
+++ b/packages/flutter_tools/lib/src/base/version.dart
@@ -98,7 +98,7 @@ class Version implements Comparable<Version> {
   }
 
   @override
-  int get hashCode => Object.hash(major, minor, patch);
+  int get hashCode => major ^ minor ^ patch;
 
   bool operator <(Version other) => compareTo(other) < 0;
   bool operator >(Version other) => compareTo(other) > 0;
diff --git a/packages/flutter_tools/lib/src/doctor_validator.dart b/packages/flutter_tools/lib/src/doctor_validator.dart
index f8ddc250d0..d5488c00c0 100644
--- a/packages/flutter_tools/lib/src/doctor_validator.dart
+++ b/packages/flutter_tools/lib/src/doctor_validator.dart
@@ -278,7 +278,7 @@ class ValidationMessage {
   }
 
   @override
-  int get hashCode => Object.hash(type, message, contextUrl);
+  int get hashCode => type.hashCode ^ message.hashCode ^ contextUrl.hashCode;
 }
 
 class NoIdeValidator extends DoctorValidator {
diff --git a/packages/flutter_tools/lib/src/ios/xcodeproj.dart b/packages/flutter_tools/lib/src/ios/xcodeproj.dart
index 5e48bf93d0..78b2cc0037 100644
--- a/packages/flutter_tools/lib/src/ios/xcodeproj.dart
+++ b/packages/flutter_tools/lib/src/ios/xcodeproj.dart
@@ -302,7 +302,7 @@ class XcodeProjectBuildContext {
   final EnvironmentType environmentType;
 
   @override
-  int get hashCode => Object.hash(scheme, configuration, environmentType);
+  int get hashCode => scheme.hashCode ^ configuration.hashCode ^ environmentType.hashCode;
 
   @override
   bool operator ==(Object other) {
diff --git a/packages/flutter_tools/lib/src/localizations/localizations_utils.dart b/packages/flutter_tools/lib/src/localizations/localizations_utils.dart
index fd435e74fe..04fcca4267 100644
--- a/packages/flutter_tools/lib/src/localizations/localizations_utils.dart
+++ b/packages/flutter_tools/lib/src/localizations/localizations_utils.dart
@@ -129,7 +129,9 @@ class LocaleInfo implements Comparable<LocaleInfo> {
   }
 
   @override
-  int get hashCode => originalString.hashCode;
+  int get hashCode {
+    return originalString.hashCode;
+  }
 
   @override
   String toString() {
diff --git a/packages/flutter_tools/lib/src/reporting/custom_dimensions.dart b/packages/flutter_tools/lib/src/reporting/custom_dimensions.dart
index 6fbd116f27..f710eb64d4 100644
--- a/packages/flutter_tools/lib/src/reporting/custom_dimensions.dart
+++ b/packages/flutter_tools/lib/src/reporting/custom_dimensions.dart
@@ -326,7 +326,12 @@ class CustomDimensions {
   }
 
   @override
-  int get hashCode => Object.hashAll(toMap().values);
+  int get hashCode =>
+    toMap()
+      .values
+      .where((String element) => element != null)
+      .fold(Object().hashCode,
+            (int value, String element) => value ^ element.hashCode);
 }
 
 /// List of all fields used in CustomDimensions.
diff --git a/packages/flutter_tools/lib/src/reporting/usage.dart b/packages/flutter_tools/lib/src/reporting/usage.dart
index 303ca501f8..d822c7daa0 100644
--- a/packages/flutter_tools/lib/src/reporting/usage.dart
+++ b/packages/flutter_tools/lib/src/reporting/usage.dart
@@ -486,7 +486,7 @@ class TestUsageCommand {
   }
 
   @override
-  int get hashCode => Object.hash(command, parameters);
+  int get hashCode => command.hashCode ^ parameters.hashCode;
 
   @override
   String toString() => 'TestUsageCommand($command, parameters:$parameters)';
@@ -514,7 +514,11 @@ class TestUsageEvent {
   }
 
   @override
-  int get hashCode => Object.hash(category, parameter, label, value, parameters);
+  int get hashCode => category.hashCode ^
+    parameter.hashCode ^
+    label.hashCode ^
+    value.hashCode ^
+    parameters.hashCode;
 
   @override
   String toString() => 'TestUsageEvent($category, $parameter, label:$label, value:$value, parameters:$parameters)';
@@ -540,7 +544,10 @@ class TestTimingEvent {
   }
 
   @override
-  int get hashCode => Object.hash(category, variableName, duration, label);
+  int get hashCode => category.hashCode ^
+    variableName.hashCode ^
+    duration.hashCode ^
+    label.hashCode;
 
   @override
   String toString() => 'TestTimingEvent($category, $variableName, $duration, label:$label)';
diff --git a/packages/flutter_tools/lib/src/vscode/vscode.dart b/packages/flutter_tools/lib/src/vscode/vscode.dart
index 85537222e0..1a48053adc 100644
--- a/packages/flutter_tools/lib/src/vscode/vscode.dart
+++ b/packages/flutter_tools/lib/src/vscode/vscode.dart
@@ -326,5 +326,5 @@ class VsCodeInstallLocation {
 
   @override
   // Lowest bit is for isInsiders boolean.
-  int get hashCode => Object.hash(installPath, extensionsFolder, edition);
+  int get hashCode => installPath.hashCode ^ extensionsFolder.hashCode ^ edition.hashCode;
 }
diff --git a/packages/flutter_tools/test/commands.shard/hermetic/clean_test.dart b/packages/flutter_tools/test/commands.shard/hermetic/clean_test.dart
index aab2b42bf9..65f413cd2b 100644
--- a/packages/flutter_tools/test/commands.shard/hermetic/clean_test.dart
+++ b/packages/flutter_tools/test/commands.shard/hermetic/clean_test.dart
@@ -219,7 +219,7 @@ class CleanWorkspaceCall {
     verbose == other.verbose;
 
   @override
-  int get hashCode => Object.hash(workspacePath, scheme, verbose);
+  int get hashCode => workspacePath.hashCode;
 
   @override
   String toString() => '{$workspacePath, $scheme, $verbose}';