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There's not much to complain about. You've implemented all improvents so the performance is now very good. But hey! This is a good thing ;-)

What's left are just a few style things:

public static void RemoveAll<K, V>(this IDictionary<K, V> dict, Func<K, V, bool> match)

These K and V should be TKey and TValue.

var distinctProcesses = new Dictionary<string, Process>();
foreach (var filteredProcess in filteredProcesses)

You use vars. Not everywhere but finally somewhere :-D

[OrderBy.Ascending.ToString()]
[ShowOptions.Default.ToString()]

I'm not very fond of these ToStrings. Why not pure enums?

bInspect_Click

The code mixes the hungarian notation - this actually should be btnInspect_Click becasue b stands for bool - with the human notation:

ProcessTrackerIcon_MouseClick

and even mixed hungarian-human notation:

ComboBoxSorting_SelectedIndexChanged

preferable:

SortingComboBox_SelectedIndexChanged

There's not much to complain about. You've implemented all improvents so the performance is now very good. But hey! This is a good thing ;-)

What's left are just a few style things:

public static void RemoveAll<K, V>(this IDictionary<K, V> dict, Func<K, V, bool> match)

These K and V should be TKey and TValue.

var distinctProcesses = new Dictionary<string, Process>();
foreach (var filteredProcess in filteredProcesses)

You use vars. Not everywhere but finally somewhere :-D

[OrderBy.Ascending.ToString()]
[ShowOptions.Default.ToString()]

I'm not very fond of these ToStrings. Why not pure enums?

bInspect_Click

The code mixes the hungarian notation - this actually should be btnInspect_Click becasue b stands for bool - with the human notation:

ProcessTrackerIcon_MouseClick

and even mixed hungarian-human notation:

ComboBoxSorting_SelectedIndexChanged

preferable:

SortingComboBox_SelectedIndexChanged

if (cbEnableAutoUpdate.Checked)
{
 RefreshList();
}

This is not very pretty. The check-box should enable/disable the timer via its Enabled property and not prevent it from doint its job like that.