TWS is a poor choice for intraday trading. Don't handicap yourself. As for the future, it will likely be browser based because they are cheap. It will only get worse.
Even if you could hack the version number in the code, this is not a long term solution, could break at anytime on a server side upgrade, as eventually there will be communication incompatibilities between the old client and new servers. The new servers just wont work with the packets the old client is sending over. They will be missing new required fields.
Havent used the newest version, so can tell you if its slow for me. Heavy charting is not TWS's thing. They dont optimize for that
Yeah but it is always sad when a previously working fine version of software degrades to the point of being unusable. My guess is the developers at IB fucking things up. Cant really blame them, TWS is probably Spaghetti code at this point.