That’s really the biggest benefit to migrating from a shared to a virtual server: Your site can grow to receive more visitors without you having to eat the higher cost and hardware responsibility of a dedicated server. VPS users are rarely first-time site owners or folks seeking a personal email server. Typically, the people using a VPS are those whose sites or apps are receiving upward of 100,000 visitors a month.
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Think of a shared server as a large apartment complex, and all of the individual apartments are rented by other website owners. All of you need a place to live — just like your website’s files — but going out to buy a huge family home would be too expensive for your needs. Sharing common areas and utilities in an apartment block helps keep costs down. And the same is true for shared hosting.

It's also possible to select different PHP "execution modes" for each site at Virtualmin > Server Configuration > Website Options - I recommend FPM because it's significantly faster and uses less memory. I've found that the default settings sometimes result in excessive memory usage, which can be avoided by adding the following settings to Virtualmin > Services > PHP-FPM Configuration, which limit the lifetime of processes if a site has a memory leak:

All your web sites should still be working, but you may find that Webmin is no longer recognising the MySQL server and you can no longer log in to mysql on the command line - you get "DBI connect failed : Plugin 'auth_socket' is not loaded". The problem arises because MariaDB no longer uses password authentication for the administration root user for security reasons, but we can restore the old behaviour. To set the root password to "new_root_database_password" for example, do this:

• Free SSL Certificate
VPS hosting contains the best elements of shared hosting and dedicated hosting services. Like shared hosting, VPS hosting puts your website on a server that also has other sites running on it, except that there are fewer sites per server. The sites share the cost of running on the server, which results in a monthly or yearly charge that's less than the relatively high price tag of dedicated hosting.
If you emphasize on high-availability and top speed at the best price, you can choose Time4VPS. Its data center is setup according to TIER III level, which guarantees 99.95% uptime.

SSLUseStapling on
If you want reasonably priced server space that won't load pages at a snail's pace when a neighboring site gets a huge traffic spike, VPS is a good option for your business. We've reviewed many VPS hosting services and included the best of the bunch in this guide. You should look into a dedicated server if you want to build a website on an even stronger foundation and can afford the bill.
Expert Overview:

The web hosting company will also provide regular web server software, installed programming language extensions, & firewall upgrades. Managed VPS plans running Windows normally include the use of Plesk for administration of domains and web server settings, while VPS plans running Ubuntu, Debian, Slackware, etc. can be administered using Webmin or Virtualmin under a free open source license.
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SSLStaplingCache "shmcb:logs/ssl_stapling(32768)"
postscreen_access_list = permit_mynetworks
You will need to change the Domain Name System (DNS) settings to point to each new site that is added to your VPS - this is how the human-readable website addresses and email addresses get translated into machine-readable IP addresses. Each DNS change can take 24 hours or more to propagate around the worldwide DNS network. If you're impatient you can access the site in "preview" mode at Virtualmin > Services > Preview Website or you can access the site directly by IP address (by entering an address like in your web browser) or you can modify the "hosts" file on your computer (on Windows this is usually located at C:\Windows\System32\drivers\etc\hosts, on a Mac it's at /etc/hosts and you need to be an administrator in both cases).
The Virtualmin interface is another way a hacker could get root access to your server. I strongly advise enabling two-factor authentication for all top-level Webmin users or any user with "sudo" access. You can do this at Webmin > Webmin Configuration > Two-Factor Authentication. I find it easiest to select "Google Authenticator" as the provider but to actually use Authy to do the authentication (because it saves messing around with API keys and because you can recover your account if you lose your phone).
Be careful, though – there are some common traps many people fall into. Firstly, the promotional prices are only on offer for a month, after which you’re paying between $49.99 and $299.99/month on any of its five plans. Secondly, the 30 day, money-back guarantee is only valid for those who subscribe for a year or longer. Everyone else only has 48 hours to claim a refund.