Sngine or any other social network script else will use a lot of server resources. Sngine like any other social network use a real-time tech to keep users up to date not just for chat
Shared Hosting is a good starting point but will not the right place to host a growing social network script and you should think to move to a VPS then to dedicated server that will be much better than shared hosting then to separate the HTTP server from the Database server to load balance finally and the best will be cloud hosting like Amazon or Google
To running a social network script smoothly you have 2 things:
1- Very good code with all optimizations and cache system.
2- Good servers to handle this traffic.
Sngine already is optimized in all aspects back-end and front-end; Sngine is #1 on PageSpeed Test from Google
Sngine (94-98 / 100): https://goo.gl/DrrsvQ
Phpdolphin(84-86 / 100): https://goo.gl/uvUXfb
Wowonder (72-75 / 100): https://goo.gl/cOv6GQ
Socialkit (65-67 / 100): https://goo.gl/aZdXei
Also Sngine #1 on GtMetrix with %99 score
And if you need a client example here it is: http://demogame.org/ with 150,000+ users and Alexa Rank of 30K World Wide.
and running so smoothly and fast.
Also you must know that you will never get Facebook, Twitter, Google+ for $50 ~ $69 or even $200+ you as network manager or website owner must do your own work to scale up your website for examples:
1- You can hire a server admin (part-time/full-time) to manage server(s) for you.
So when you got high server load you must know it’s the time to scale up moving from VPS to VPS will not solve the problem also move from Sngine to any other social network script will not solve the problem. simply scale up your network hosting
That’s it 😉