First test with corona made about 2-3 weeks ago by simply converting an old V-ray sceene, renderd trough the night on the worst machine we have ( i5 2320 with 8Gb RAM).
We encounterd a strange problem with corona using resolutionons with width lower than heigh for example 1000x2000, framebufer starts glitching around and strats to affect calculation time if it is not minimized.