If xrender is butt slow and xvinfo has no screens that usually means that the drm code is either wrong or missing and you have no acceleration at all.
Are you using drm built from either the 6xx-7xx support branch or drm/next ? If so, can you pastebin x log and dmesg output ?
Are you using drm built from either the 6xx-7xx support branch or drm/next ? If so, can you pastebin x log and dmesg output ?
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