Improve performance of ImageMagick thumbnail generation [closed]

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I am currently generating thumbnails via ImageMagick's convert tool in this manner:

/usr/bin/convert input.jpg -size 140x93 -resize 740 -resize 186 \
-gravity center -crop 140x93+0+0 -format jpg -quality 90 jpg:output.jpg

But I feel like the conversion time is taking too long. It's about 5 seconds per thumbnail on an 8-core 2.5GHz Xeon. Is there any way I can optimize this or increase the performance while maintaining the crop and gravity center?

Thanks.