Rendering of multiple framebuffers object leads to degraded render performance with Wayland

Rendering of multiple instances of a framebuffer object leads to degraded render performance on Wayland platform. The similar effect does not happen on other QPA's like xcb or eglfs.

Steps to reproduce:

1. Run the compositor in attached example project qmlscene compositor.qml
2. Execute the application with Wayland  ./qquickviewcomparison -platform wayland

Expected result:

1. The animation runs smoothly on three framebuffer object.

Actual result:

1. The animation performance is heavily impaired and frame rate goes down to 5-8FPS.