Java ImageIO.write() takes up to 6 seconds

Question

I am writing an web application where I need to send an image from servlet to client. Image is generated dynamically and is quite big(+-2MB). It might be jpeg, png, or gif.<

Answer 1

Be aware that ImageIO by default uses temporary files as cache when creating ImageInputStreams and ImageOutputStreams. This can be switched off by calling ImageIO.setUseCache(false).

For a more detailed explanation see this answer.