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and secondly when I am consildating a snapshot will my vm slow down
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Yes.<br />
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Host and VM will be busy.<br />
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The datastore, storage I/O will be high, and hence IOPS will be reduced in the VM, e.g. reading and writing to disk
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Is there any way of knowing how long snap shot will take to commit.
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So I have read lots of articles about vm snapshots best practice as they have impact on performance. What I am not clear on is if I drill into my VM and look at the memory and cpu will I see and increase in the VM or is this all outside the vm on the actual host that it is busy? <br />
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and secondly when I am consildating a snapshot will my vm slow down
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So I have read lots of articles about vm snapshots best practice as they have impact on performance. What I am not clear on is if I drill into my VM and look at the memory and cpu will I see and increase in the VM or is this all outside the vm on the actual host that it is busy? 

and secondly when I am consildating a snapshot will my vm slow down

VMware snapshot perf impact to VM

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.

Virtualization

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.