Web Browser Source FPS

I have a problem with the Web Browser Source used in a placer to add HTML5 generated graphics by a tool such as Flowics, Overlays.Uno or Singular.Live. The Source Performance Monitor within Mimo shows a very low frame rate of around 3FPS for the Web Browser Source which results in stuttering and very rough playback of eg. animated lower thirds being generated by the external tool. Any way to force the web browser source to the same FPS as the document itself?