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1. Do the ESXI servers have enough physical ram and CPU cores to run all the VMs?<br />
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2. Do the VMs have enough cores per socket and memory assigned for the VMs (depending on the VMs memory and cpu usage)?<br />
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Could you give more information on which VMs are slow or is it everything?
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Curtis Long

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Do you have just one physical host with ESXi installed? &nbsp;How many guest servers are running on your ESXi host. &nbsp;What are the specs of the server ESXi is installed on (number of sockets/cores, memory, HDD spindle speeds, what is the raid configuration), what are your guest servers using for resources. &nbsp;<br />
There are many things that can contribute to server(s) running slow on ESXi but we need to know some of the hardware specs of the host and also the guest servers settings to help out some.<br />
As a quick guess, it could be an over commitment of resources of your guest servers. &nbsp;It could be disk I/O, where you have a lot of data being written and read from the disks. &nbsp;Network congestion when trying to access the servers via RDP.<br />
If you can get us this info, it will help us with providing some possible solutions for you.
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Well a lot of factors could limit the performance of your VMs but the first thing that comes to my mind is why to RDP....why they use VMs...do they have slim terminals or they use VMs to cover a specific need....e.g. if they are all running an application i guess it would be better to optimize the application performance than to optimize the VMs...
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I will gather some data and return and report
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I have attached a summary screen shot of the server ram and cpu usage<a href="https://filedb.experts-exchange.com/incoming/2017/11_w47/1212184/serverusage.JPG" target="_blank" title="serverusage.JPG (26 KB)"><img alt="serverusage.JPG" class="file-block lazyload" style="max-width: 713px;" data-src="https://filedb.experts-exchange.com/incoming/2017/11_w47/1212184/serverusage.JPG" /></a>
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serverusage.JPG

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Also a screen shot of the VMs<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/11_w47/1212185/vms.JPG" target="_blank" title="vms.JPG (110 KB)"><img alt="vms.JPG" class="file-block lazyload" style="max-width: 761px;" data-src="https://filedb.experts-exchange.com/incoming/2017/11_w47/1212185/vms.JPG" /></a>
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vms.JPG

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Just at a quick glance, CPU usage is low, and your max available memory is getting close to being capped but you still have a little buffer should ESXi require more. &nbsp;<br />
Nothing is really standing out at me here that would state an over commitment of resources being the cause of slowness. &nbsp;Have you looked at the performance tab and checked the results for your local resources? &nbsp;If not, I would start with the performance monitor tab and look into any large percentage of use. &nbsp;If I were to just guess from what you have provided... I would say it could be disk or network related where nothing else stands out.<br />
What do you know about the disk and network configuration of this host?
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I know how to set up the disks and network interfaces. &nbsp;As for setting up optimal configs......not a lot
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I just started helping at an office where they have a server with esxi 6.0 setup.<br />
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They have several servers and workstations VMs setup.<br />
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They use windows RDP to access the VMs<br />
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Things seem to work ok but also seem a bit slow on occasion.<br />
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What can I look for to fine tune the install??<br />
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Is there a better remote access solution to use that may work better??
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I just started helping at an office where they have a server with esxi 6.0 setup.

They have several servers and workstations VMs setup.

They use windows RDP to access the VMs

Things seem to work ok but also seem a bit slow on occasion.

What can I look for to fine tune the install??

Is there a better remote access solution to use that may work better??

ESXI best setup

Remote access may refer to the connection to a data-processing system from a remote location, for example through a virtual private network remote desktop software, terminal emulation, or the activation of features of a business telephone system from outside the business's premises.

Remote Access

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.