diff --git a/docs/api-output.md b/docs/api-output.md
index e41f011b..8a91f6a5 100644
--- a/docs/api-output.md
+++ b/docs/api-output.md
@@ -282,7 +282,7 @@ Use these WebP options for output image.
     *   `options.lossless` **[boolean][7]** use lossless compression mode (optional, default `false`)
     *   `options.nearLossless` **[boolean][7]** use near_lossless compression mode (optional, default `false`)
     *   `options.smartSubsample` **[boolean][7]** use high quality chroma subsampling (optional, default `false`)
-    *   `options.effort` **[number][9]** level of CPU effort to reduce file size, integer 0-6 (optional, default `4`)
+    *   `options.effort` **[number][9]** CPU effort, between 0 (fastest) and 6 (slowest) (optional, default `4`)
     *   `options.pageHeight` **[number][9]?** page height for animated output
     *   `options.loop` **[number][9]** number of animation iterations, use 0 for infinite animation (optional, default `0`)
     *   `options.delay` **[Array][10]<[number][9]>?** list of delays between animation frames (in milliseconds)
@@ -460,7 +460,7 @@ AVIF image sequences are not supported.
 
     *   `options.quality` **[number][9]** quality, integer 1-100 (optional, default `50`)
     *   `options.lossless` **[boolean][7]** use lossless compression (optional, default `false`)
-    *   `options.speed` **[number][9]** CPU effort vs file size, 0 (slowest/smallest) to 9 (fastest/largest) (optional, default `5`)
+    *   `options.effort` **[number][9]** CPU effort, between 0 (fastest) and 9 (slowest) (optional, default `4`)
     *   `options.chromaSubsampling` **[string][2]** set to '4:2:0' to use chroma subsampling (optional, default `'4:4:4'`)
 
 <!---->
@@ -487,7 +487,7 @@ globally-installed libvips compiled with support for libheif, libde265 and x265.
     *   `options.quality` **[number][9]** quality, integer 1-100 (optional, default `50`)
     *   `options.compression` **[string][2]** compression format: av1, hevc (optional, default `'av1'`)
     *   `options.lossless` **[boolean][7]** use lossless compression (optional, default `false`)
-    *   `options.speed` **[number][9]** CPU effort vs file size, 0 (slowest/smallest) to 9 (fastest/largest) (optional, default `5`)
+    *   `options.effort` **[number][9]** CPU effort, between 0 (fastest) and 9 (slowest) (optional, default `4`)
     *   `options.chromaSubsampling` **[string][2]** set to '4:2:0' to use chroma subsampling (optional, default `'4:4:4'`)
 
 <!---->
diff --git a/docs/changelog.md b/docs/changelog.md
index e5a842cd..d69f1ddb 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -12,6 +12,8 @@ Requires libvips v8.12.0
 
 * Standardise WebP `effort` option name, deprecate `reductionEffort`.
 
+* Standardise HEIF `effort` option name, deprecate `speed`.
+
 * Expose control over CPU effort for palette-based PNG output.
   [#2541](https://github.com/lovell/sharp/issues/2541)
 
diff --git a/lib/constructor.js b/lib/constructor.js
index 833beac8..eb25abfd 100644
--- a/lib/constructor.js
+++ b/lib/constructor.js
@@ -264,7 +264,7 @@ const Sharp = function (input, options) {
     heifQuality: 50,
     heifLossless: false,
     heifCompression: 'av1',
-    heifSpeed: 5,
+    heifEffort: 4,
     heifChromaSubsampling: '4:4:4',
     rawDepth: 'uchar',
     tileSize: 256,
diff --git a/lib/output.js b/lib/output.js
index daa15ef2..0c28d195 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -457,7 +457,7 @@ function png (options) {
  * @param {boolean} [options.lossless=false] - use lossless compression mode
  * @param {boolean} [options.nearLossless=false] - use near_lossless compression mode
  * @param {boolean} [options.smartSubsample=false] - use high quality chroma subsampling
- * @param {number} [options.effort=4] - level of CPU effort to reduce file size, integer 0-6
+ * @param {number} [options.effort=4] - CPU effort, between 0 (fastest) and 6 (slowest)
  * @param {number} [options.pageHeight] - page height for animated output
  * @param {number} [options.loop=0] - number of animation iterations, use 0 for infinite animation
  * @param {number[]} [options.delay] - list of delays between animation frames (in milliseconds)
@@ -806,7 +806,7 @@ function tiff (options) {
  * @param {Object} [options] - output options
  * @param {number} [options.quality=50] - quality, integer 1-100
  * @param {boolean} [options.lossless=false] - use lossless compression
- * @param {number} [options.speed=5] - CPU effort vs file size, 0 (slowest/smallest) to 9 (fastest/largest)
+ * @param {number} [options.effort=4] - CPU effort, between 0 (fastest) and 9 (slowest)
  * @param {string} [options.chromaSubsampling='4:4:4'] - set to '4:2:0' to use chroma subsampling
  * @returns {Sharp}
  * @throws {Error} Invalid options
@@ -827,7 +827,7 @@ function avif (options) {
  * @param {number} [options.quality=50] - quality, integer 1-100
  * @param {string} [options.compression='av1'] - compression format: av1, hevc
  * @param {boolean} [options.lossless=false] - use lossless compression
- * @param {number} [options.speed=5] - CPU effort vs file size, 0 (slowest/smallest) to 9 (fastest/largest)
+ * @param {number} [options.effort=4] - CPU effort, between 0 (fastest) and 9 (slowest)
  * @param {string} [options.chromaSubsampling='4:4:4'] - set to '4:2:0' to use chroma subsampling
  * @returns {Sharp}
  * @throws {Error} Invalid options
@@ -855,9 +855,15 @@ function heif (options) {
         throw is.invalidParameterError('compression', 'one of: av1, hevc', options.compression);
       }
     }
-    if (is.defined(options.speed)) {
+    if (is.defined(options.effort)) {
+      if (is.integer(options.effort) && is.inRange(options.effort, 0, 9)) {
+        this.options.heifEffort = options.effort;
+      } else {
+        throw is.invalidParameterError('effort', 'integer between 0 and 9', options.effort);
+      }
+    } else if (is.defined(options.speed)) {
       if (is.integer(options.speed) && is.inRange(options.speed, 0, 9)) {
-        this.options.heifSpeed = options.speed;
+        this.options.heifEffort = 9 - options.speed;
       } else {
         throw is.invalidParameterError('speed', 'integer between 0 and 9', options.speed);
       }
diff --git a/src/pipeline.cc b/src/pipeline.cc
index 24e25103..74a8b148 100644
--- a/src/pipeline.cc
+++ b/src/pipeline.cc
@@ -899,7 +899,7 @@ class PipelineWorker : public Napi::AsyncWorker {
             ->set("strip", !baton->withMetadata)
             ->set("Q", baton->heifQuality)
             ->set("compression", baton->heifCompression)
-            ->set("speed", baton->heifSpeed)
+            ->set("effort", baton->heifEffort)
             ->set("subsample_mode", baton->heifChromaSubsampling == "4:4:4"
               ? VIPS_FOREIGN_SUBSAMPLE_OFF : VIPS_FOREIGN_SUBSAMPLE_ON)
             ->set("lossless", baton->heifLossless)));
@@ -1053,7 +1053,7 @@ class PipelineWorker : public Napi::AsyncWorker {
             ->set("strip", !baton->withMetadata)
             ->set("Q", baton->heifQuality)
             ->set("compression", baton->heifCompression)
-            ->set("speed", baton->heifSpeed)
+            ->set("effort", baton->heifEffort)
             ->set("subsample_mode", baton->heifChromaSubsampling == "4:4:4"
               ? VIPS_FOREIGN_SUBSAMPLE_OFF : VIPS_FOREIGN_SUBSAMPLE_ON)
             ->set("lossless", baton->heifLossless));
@@ -1512,7 +1512,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->heifCompression = static_cast<VipsForeignHeifCompression>(
     vips_enum_from_nick(nullptr, VIPS_TYPE_FOREIGN_HEIF_COMPRESSION,
     sharp::AttrAsStr(options, "heifCompression").data()));
-  baton->heifSpeed = sharp::AttrAsUint32(options, "heifSpeed");
+  baton->heifEffort = sharp::AttrAsUint32(options, "heifEffort");
   baton->heifChromaSubsampling = sharp::AttrAsStr(options, "heifChromaSubsampling");
 
   // Raw output
diff --git a/src/pipeline.h b/src/pipeline.h
index 0f0443e6..d461a64d 100644
--- a/src/pipeline.h
+++ b/src/pipeline.h
@@ -176,7 +176,7 @@ struct PipelineBaton {
   double tiffYres;
   int heifQuality;
   VipsForeignHeifCompression heifCompression;
-  int heifSpeed;
+  int heifEffort;
   std::string heifChromaSubsampling;
   bool heifLossless;
   VipsBandFormat rawDepth;
@@ -314,7 +314,7 @@ struct PipelineBaton {
     tiffYres(1.0),
     heifQuality(50),
     heifCompression(VIPS_FOREIGN_HEIF_COMPRESSION_AV1),
-    heifSpeed(5),
+    heifEffort(4),
     heifChromaSubsampling("4:4:4"),
     heifLossless(false),
     rawDepth(VIPS_FORMAT_UCHAR),
diff --git a/test/unit/avif.js b/test/unit/avif.js
index cd699149..98c37702 100644
--- a/test/unit/avif.js
+++ b/test/unit/avif.js
@@ -17,10 +17,9 @@ describe('AVIF', () => {
       .resize(32)
       .jpeg()
       .toBuffer();
-    const metadata = await sharp(data)
+    const { size, ...metadata } = await sharp(data)
       .metadata();
-    const { compression, size, ...metadataWithoutSize } = metadata;
-    assert.deepStrictEqual(metadataWithoutSize, {
+    assert.deepStrictEqual(metadata, {
       channels: 3,
       chromaSubsampling: '4:2:0',
       density: 72,
@@ -38,13 +37,13 @@ describe('AVIF', () => {
   it('can convert JPEG to AVIF', async () => {
     const data = await sharp(inputJpg)
       .resize(32)
-      .avif()
+      .avif({ effort: 0 })
       .toBuffer();
-    const metadata = await sharp(data)
+    const { size, ...metadata } = await sharp(data)
       .metadata();
-    const { compression, size, ...metadataWithoutSize } = metadata;
-    assert.deepStrictEqual(metadataWithoutSize, {
+    assert.deepStrictEqual(metadata, {
       channels: 3,
+      compression: 'av1',
       depth: 'uchar',
       format: 'heif',
       hasAlpha: false,
@@ -63,11 +62,11 @@ describe('AVIF', () => {
     const data = await sharp(inputAvif)
       .resize(32)
       .toBuffer();
-    const metadata = await sharp(data)
+    const { size, ...metadata } = await sharp(data)
       .metadata();
-    const { compression, size, ...metadataWithoutSize } = metadata;
-    assert.deepStrictEqual(metadataWithoutSize, {
+    assert.deepStrictEqual(metadata, {
       channels: 3,
+      compression: 'av1',
       depth: 'uchar',
       format: 'heif',
       hasAlpha: false,
@@ -85,12 +84,11 @@ describe('AVIF', () => {
   it('can convert animated GIF to non-animated AVIF', async () => {
     const data = await sharp(inputGifAnimated, { animated: true })
       .resize(10)
-      .avif({ speed: 8 })
+      .avif({ effort: 0 })
       .toBuffer();
-    const metadata = await sharp(data)
+    const { size, ...metadata } = await sharp(data)
       .metadata();
-    const { size, ...metadataWithoutSize } = metadata;
-    assert.deepStrictEqual(metadataWithoutSize, {
+    assert.deepStrictEqual(metadata, {
       channels: 4,
       compression: 'av1',
       depth: 'uchar',
diff --git a/test/unit/heif.js b/test/unit/heif.js
index 52314562..36a73e3a 100644
--- a/test/unit/heif.js
+++ b/test/unit/heif.js
@@ -50,6 +50,21 @@ describe('HEIF', () => {
       sharp().heif({ compression: 1 });
     });
   });
+  it('valid effort does not throw an error', () => {
+    assert.doesNotThrow(() => {
+      sharp().heif({ speed: 6 });
+    });
+  });
+  it('out of range effort should throw an error', () => {
+    assert.throws(() => {
+      sharp().heif({ effort: 10 });
+    });
+  });
+  it('invalid effort should throw an error', () => {
+    assert.throws(() => {
+      sharp().heif({ effort: 'fail' });
+    });
+  });
   it('valid speed does not throw an error', () => {
     assert.doesNotThrow(() => {
       sharp().heif({ speed: 6 });
@@ -62,7 +77,7 @@ describe('HEIF', () => {
   });
   it('invalid speed should throw an error', () => {
     assert.throws(() => {
-      sharp().heif({ compression: 'fail' });
+      sharp().heif({ speed: 'fail' });
     });
   });
   it('invalid chromaSubsampling should throw an error', () => {