I just downloaded HL 2 on Steam and it was a bit laggy. When I first started the game there was no sound in the train for a few seconds. It also jumps a bit here and there and a random loading screen pops up in the middle and stays for about 20 seconds. I also lost sound again during the part when the main character is being teleported. Isn't this game a few years old now? I expected it to run flawlessly. Is there something wrong here?