Okay - first pardon any inflection of lack-of-emotion that you may feel when reading my comment, I am autistic and sometimes the way I am read comes across as an ass.

I am running a machine that is very far from state-of-the-art. However, my server hosts a zombie arena. In the span of 10 minutes, you can kill up to 4-5 thousand NPCs. I experience no lag, and it's really quite fun... BUT - the issues I've gathered from your experience isn't just a matter of what you are doing when you play cinema, it's also HOW you're doing it. Spawning lots of NPCs will kill anyone's gameplay experience purely on the principle of how players can connect to play in your gameplay environment. A remote server however - how information passes to and from your machine correlates directly with how fast and how efficiently your computer can receive and display information sent to it. That means lag can exist not just in the game, but graphically, and though computer networking. If you are hosting the server directly on your machine, not only are you running the environment, you are sending it to others - and they are sending you information as well... networking lag can occur, particularly if your antivirus is a lil' b*tch.

Which leads me to my point. Most players aren't paying to have their cinema server hosted remotely - which means you're going to experience some form of lagging - albeit graphically (video card outdated for a 14 year old game???), through networking (connectors pass through your firewalls, routers, etc - you pass through theirs), directly through processing strength (update your chipset bro), and from a computer that is lackluster.

I second your motion to advise players to revert your game back to default from x86-64 but I also encourage players and server owners to test out their performing server with as many people as they can, and keep tabs on experiences by each player.

I meant mostly because of performance issues that may be unoticed or seem related to the system itself, (I was unaware of it untill I reverted to the normal game, because of a lot of crashes that happened, when the game randomly froze because of much stuff happening on screen, which in normal game (not beta) it would just go back to the game after some seconds, but in the beta it would crash most of the time, then I realized that in maps like gm highway or big city improved, the number of npc I could spawn without noticing performance issues was much bigger than in the beta. but I know that if a pc is able to handle 1000 npc at the same time on the normal version, will not notice much difference if it can handle just 700 or 500 on the beta (just to make a random number)

Here is a bit of info I found out about multi-core processing and gmod, although some of it is hypothetical - when do they ever tell us the reality though? XD

The game threads things out differently than when not in the default game settings mode. Depending on your processor, somethings are awesome, others are worse because multi-core processing is an in-dev feature that the 86-64 build uses. I suspect that this is what you are experiencing, which may be worsened by a non-solid state drive. An analogy for this would be a fire hydrant spilling water into the sink. That sink is going to fill up and overflow before it travels down the drain to the disk. It's possible that you are experiencing that, but I doubt it is a disk issue.

Nonetheless I agree with you. I could be entirely wrong, but it sounds like your processor is floodfilling a drive possibly.

it may be something related to that, but for sure is an stability issue also, because in normal mode, whenever the game frozes for a second or two because whatever random issue with (npcs usually) the game recovers and works again, but in the beta for 64 bits, it crashes. I havent tried the beta in 32 bits, but I suspect is much the same. I have read some comments also regarding that more addons are usually broken in the beta than in the normal version for obvious reasons. I think it may be the reason why not many people goes to cinema servers, cause it is really no much worth to have a very unstable game just for a game mode.

I am just going to say this - the default awesomium browser is VASTLY outdated, and so is chromium. But chromium does include features that allow scripts to run (java) and also include the ability of HTTPS and HTTP vs awesomium's limited HTTP protocols (https wasn't a necessity at the time of awesomium's deployment/creation.) Until the browser is updated, or the base moves to an alternative to chromium, we're stuck at an impasse.

yeah,and I would add, that it made me think about something I saw on a post about an addon being broken in the beta: I have seen many people complaining about addons that dont work, but they work for other people, I suspect it can many of them related to the beta, (also maybe other addons like pac3 that are broken by itself) but there is a chance much new players subscribe to the beta in order to give a try the cinema mode, and they dont know it can make unusable many other addons.