Chroma key in Lightworks(Free) vs Blender

Hi, I am YongKang and I had been using both software simultaneously for some time now. The only problem I see when I am using Blender is when I am doing chroma keys. In Lightworks, chroma keys are rendered significantly faster than Blender. Lightworks can even play the keyed video live with no noticeable lag compared to Blender. So my question is, will Blender ever be on the same level as Lightworks in terms of simple chroma keys and time taken to render? I need not include 3D elements, just like a keyed video over another one.Is there any form of plugin for Blender to allow me to use chroma keys in VSE instead of the Compositor?