Internet lags with more than one device?

I just moved into a new house with my grandparents and we recently signed on for the verizon 'high speed Internet' dsl packages wherein we were sent a modem router (2750B). I hooked everything up perfectly fine and connected the devices wirelessly. Yet when I use more than 1 of these, the connection becomes laggy an slow. When I play my ps4 and use my iphone to listen to youtube videos like i did at my old house, my ps4 an iPhone lag and I'm forced to shut one off. I'm not tech savvy, so what am I doing wrong? Do I need to upgrade or change services? Btw, my download/upload speed is 800kbps/350kbps if that helps.

Sorry, but your real problem is the wireless devices. Wireless (and cable broadband) is a party line. The access point can only talk to one device at a time forcing the others to wait for a turn. Then they interfere with each other which stops data moving for a period of time while everyone fights for air time. Anything that is data intensive will want to talk often, and will try to transmit over and over. This is known as the party line effect. What you can DO is use wire instead of wireless and you will not have a problem. The wired portion of the router directs traffic so there's no competition for time as there in on wireless. By the way, all wireless connections go through ONE port on the wired router (connected internally), which means shared bandwidth of the port. Individual wired ports are not shared. Shift to wire instead of wireless and you will see a large improvement in performance of All the devices connected by wire to the router.

Those speeds suck, even for DSL.

Remember, Internet bandwidth is shared.

For example, If you pay for a 800 Kbps Internet connection, you will get approximately 800 Kbps.

No router or connection settings will change your 800 Kbps Internet speed. This connection bandwidth is shared by your entire home network via your router.

If one user is utilizing 500 Kbps of the bandwidth to download a file, that would only leave 300 Kbps to be shared by all of the rest of the users on your home network.

Those speeds are way to slow for anything but minimal browsing, email, etc. You can't even stream Netflix at minimal quality without 1.5 Mbps. A Ultra HD Movie requires a minimum of 25 Mbps. Here are Netflix's minimum speed recommendations for various resolutions. https://help.netflix.com/...n/node/306

That being said,

Internet speeds and pricing vary greatly by geographical area. Various Internet plans are sold with specific speeds (Mbps) and monthly fair usage limits (data caps).

Depending on your exact location, you may be able to choose from several different types of broadband Internet access. They include DSL, cable, fiber, satellite, and wireless from a cellular provider.

DSL is generally the cheapest broadband option, however it is also usually the slowest. DSL Internet is transmitted over standard twisted pair copper telephone lines. DSL speeds typically range from 256 Kbps to 12 Mbps.

Cable Internet is transmitted over coaxial television cables. Cable Internet speeds range from 1 Mbps to over 300 Mbps. The speed of the service depends on your exact area and service package that you order.

Fiber optic services can be as fast as 1000 Mbps, Fiber connections can also provide on demand HD television and digital telephone service on the same line.

There are also 3G and 4G wireless mobile broadband services and satellite Internet, but these are normally only used where cable or DSL are unavailable due to the higher cost, slower speeds and low monthly bandwidth limits.

To compare speed and prices of your local ISP competitors, go to a ISP comparison site that lets you input your address, and compare the pricing and terms of the offers that are available in your area. In the US you can use this one http://isp1.us/find/ otherwise do a search for "ISP comparison" at your favorite search engine.

The physical address is needed because some services, particularly DSL, are very distance sensitive. For example you might be able to get a specific level of service while your next door neighbor can't.

You'll want to pick the fastest plan that fits your budget. In some areas this can be 300 Mbps+. But these high end broadband plans are expensive. You may find that something in the 10 to 50 Mbps range might satisfy your needs at a much lower cost.

You are using the lowest tier of Internet speed which is DSL. To get a better connection you will need fiber to the premise, or FiOS / FiOS Quantum. The speeds you are getting are fine for casual browsing but as soon as someone attempts to watch videos in HD or streaming movies, the quality will drop significantly.