I think for a beginner demo account is a must to practice trading and for an experienced trader live account, as they are aware of all the trading fundamentals.
Agreed! Confidence boosts up a trader and he's able to focus much better on the markets, even having a sound trading plan can help in overcoming fears, since it helps a trader to avoid confusions at times of difficulties.
Just check for some other alternatives. I prefer not to rely on a single browser all the time. Also, if others are also working slow, then most probably the issue is in your system.