diff --git a/codecs/webp_enc/webp_enc.cpp b/codecs/webp_enc/webp_enc.cpp
index 379912ac..3f22badc 100644
--- a/codecs/webp_enc/webp_enc.cpp
+++ b/codecs/webp_enc/webp_enc.cpp
@@ -26,7 +26,8 @@ val encode(std::string img, int width, int height, WebPConfig config) {
     throw std::runtime_error("Unexpected error");
   }
 
-  pic.use_argb = 1;
+  // Only use use_argb if we really need it, as it's slower.
+  pic.use_argb = config.lossless || config.use_sharp_yuv || config.preprocessing > 0;
   pic.width = width;
   pic.height = height;
   pic.writer = WebPMemoryWrite;
diff --git a/codecs/webp_enc/webp_enc.wasm b/codecs/webp_enc/webp_enc.wasm
index 2dc63207..99f10d5b 100644
Binary files a/codecs/webp_enc/webp_enc.wasm and b/codecs/webp_enc/webp_enc.wasm differ