Nikons have smile detection, blink prevention. Sony cameras have background blurring and HDR in the AUTO mode. These are just some examples. Modern day cameras are so features-rich, sometimes we have to sacrifice certain other things. We have to bear with slower speed. That doesn't mean Sony or Nikon cameras are slow or have slow processors.
Sony camera models like DSC-HX10V offer background blurr where actually two or more photos are taken and they are combined to give you SLR like background blurr (bokeh). This can cause you to wait for 5 seconds. If waiting bothers you, turn this off if your camera has it.
Background DefocusDSLR photographs are often beautiful because they blur the background, putting the emphasis on the subject. Now our point-and-shoot cameras can deliver this signature DSLR benefit. The system takes two shots, identifies the background and applies a defocused background keeping the subject crisp and clear.
Superior Auto mode
Get cleaner, more dynamic pictures and fewer missed shots. The DSC-HX10V automatically recognizes the correct scene mode, then quickly shoots and combines up to six shots to produce images with greater clarity, optimum dynamic range using backlight correction HDR technology and lower image noise using 6 shots layering technology. Superior Auto intelligently detects 33 scenes for still images and movies, making it easy to get the best shot.
So instead of worrying about slower camera speed, you should look at what the camera is doing for you. If the slower speed bothers you, look into your camera menu and disable such features. You will note significant improvement in picture taking speed.
Also, to get better out of your memory card, format it within a camera. This way, the camera will optimize cluster size, allocation block size etc to get you optimum storage capacity and speed.
One more thing that effects camera's processing. It you are taking photos indoor or in dull light, sometime camera has to keep the shutter open too long. That can affect the speed of your camera.
Last, but no the least, if you have a 20MP camera, you don't need to take every photo in 10MP mode!
Read this article about how many MP you really need for most of your photos: