Make sure WebGL is enabled < yes
Avoid using too many objects or particles < how many is too many? 200?
Place objects using the same blend modes or effects on the same layer. > Yes
Avoid objects with large areas of transparency. < yes
Avoid large areas of overlap between objects. < this maybe the problem. i have some object sandwich with each other, but they are only menus. i wonder if it effects the overall performance.
no virus / malware in that link. please ignore warning.