diff --git a/src/lib/optimizer.ts b/src/lib/optimizer.ts
index b9a9f59..d5df5aa 100644
--- a/src/lib/optimizer.ts
+++ b/src/lib/optimizer.ts
@@ -27,15 +27,15 @@ export function optimizeImage({
   }
 
   if (contentType === AVIF) {
-    const avifQuality = Math.max(quality - 25, 45)
+    const avifQuality = Math.max(quality - 25, 40)
     transformer
       .avif({
-        effort: 3,
+        effort: 4,
         quality: avifQuality,
         chromaSubsampling: '4:2:0', // same as webp
         bitdepth: 8,
       })
-      .sharpen()
+      .sharpen({ sigma: 0.5, m1: 0.5, m2: 1.5 })
   } else if (contentType === WEBP) {
     transformer.webp({ quality })
   } else if (contentType === PNG) {
diff --git a/src/server/routes/image.ts b/src/server/routes/image.ts
index dcdaaa7..aad023a 100644
--- a/src/server/routes/image.ts
+++ b/src/server/routes/image.ts
@@ -4,12 +4,7 @@ import fs from 'fs'
 import { NumberFromString } from 'io-ts-types'
 import { PassThrough } from 'node:stream'
 
-import {
-  AVIF,
-  returnOriginalFormats,
-  supportedFormats,
-  supportedTargetFormats,
-} from '@/consts'
+import { returnOriginalFormats, supportedFormats, supportedTargetFormats } from '@/consts'
 import { getWithCache } from '@/lib/cache'
 import { config, shouldUseOssCompressionForAvif } from '@/lib/config'
 import { D, E, O } from '@/lib/fp'