While there may be some merit to these timing tells, I would be loathe to base my whole read of a situation on them. For sure the insta check/insta raise certainly tells us something about what a player thinks of his hand. However, when it comes to players taking longer than usual to act, this could purely be due to them experiencing a poor connection and may appear to be taking longer than usual to bet as a result. Sometimes I bet and there is a delay of up to 10 secs before the action shows on the table (and this is with broadband). Personally, I always count to at least 5 before taking any action unless I know I'm folding junk pre flop in ep.