This is a great effort, when you are talking about response time, it is ping response. Also, it would be a ping response on their primary site (which will usually give you 100% uptime). But, it depends on the response time of the shared Hosting server, where the websites are actually hosted - and what is the page load time. For instance, BlueHost on their primary website has 100% uptime and with a great response time. As soon as you get onto one of their servers, I have seen website page load time shoots up to over 30s.

Alexandra Leslie’s interest in website administration was sparked in her teens, priming her for a fast-paced career in managing, building, and contributing to online brands, including HostingAdvice, Forbes, and the blogs of prominent hosting providers. She brings to the table firsthand experience in reviewing web hosts, perfecting website design, optimizing content, and walking site owners through the steps that add up to a successful online presence. Today, she combines her extensive writing experience with technical understanding to unpack some of the most complex topics that daunt novice website owners, as well as the subjects that excite veteran technologists within the HostingAdvice readership.
Unmetered hosting is generally offered with no limit on the amount of data-transferred on a fixed bandwidth line. Usually, unmetered hosting is offered with 10 Mbit/s, 100 Mbit/s or 1000 Mbit/s (with some as high as 10Gbit/s). This means that the customer is theoretically able to use ~3 TB on 10 Mbit/s or up to ~300 TB on a 1000 Mbit/s line per month, although in practice the values will be significantly less. In a virtual private server, this will be shared bandwidth and a fair usage policy should be involved. Unlimited hosting is also commonly marketed but generally limited by acceptable usage policies and terms of service. Offers of unlimited disk space and bandwidth are always false due to cost, carrier capacities and technological boundaries.[3]
Partitioning a single server to appear as multiple servers has been increasingly common on microcomputers since the launch of VMware ESX Server in 2001. The physical server typically runs a hypervisor which is tasked with creating, releasing, and managing the resources of "guest" operating systems, or virtual machines. These guest operating systems are allocated a share of resources of the physical server, typically in a manner in which the guest is not aware of any other physical resources save for those allocated to it by the hypervisor. As a VPS runs its own copy of its operating system, customers have superuser-level access to that operating system instance, and can install almost any software that runs on the OS; however, due to the number of virtualization clients typically running on a single machine, a VPS generally has limited processor time, RAM, and disk space.[2]
The company also offers higher-end Windows and Linux servers, available with Plesk and cPanel respectively. We were very intrigued to see that the company offers low-end Atom-based dedicated servers as well as the more traditional Xeon-based machines. One great resource for those doing some basic experimentation, or site development, is that it has a free, three-month trial for one of its lightly equipped Atom servers.
CloudLinux helps protect websites in a shared website hosting environment. If one of the websites on the servers gets attacked or gets a sudden growth in popularity and a lot of unexpected traffic, it will start draining all of the server resources, affecting other websites. CloudLinux makes sure this doesn’t happen. It will either slow down the website to stop it from hogging all resources or it will temporarily shut it down.

It shouldn't come as any surprise that, like other web host providers, A2 Hosting's unlimited plans aren't actually unlimited. It expect you to use its service like "similarly situated customers." This is like being on a highway. If everyone is going a few miles above the speed limit, you're probably okay, but if you're barreling down the fast lane past everyone else, you're probably going to be asked to slow down.
When it's time to set up shop, look for a web host that offers the aforementioned dedicated servers, as well as advanced cloud server platforms (such as Amazon Web Services or Google Cloud), custom server builds should you need it, and 24/7 customer support. Depending on your business' focus, you may need a web host that can handle pageviews or visitors that rank in the high thousands or millions. Many busy hosting plans offer an onboarding specialist that can help you get started, too.
VPS hosting sits in the intersection of shared hosting and dedicated servers. Unlike shared hosting, VPS is an isolated environment with dedicated resources, which means you have more processing power and your site loads faster. VPS is best suited for applications that have seasonal traffic spikes or RAM-heavy/CPU-intensive applications. If you are developing a new application that has a complex database and you’re not sure how many visits you’ll get, VPS hosting is the affordable option to start with before you upgrade to a dedicated server.

I was running a small private weather website in AWS and the satellite images got "picked up" by a news website and they regularly use them during major weather evenings. AWS' 12c per GB of outbound network traffic made things expensive and VPSServer makes this a lot more manageable and has excellent data volumes included with the price of the VPS. I also get many more CPUs for the price compared to AWS, so I am a happy customer.