What is the difference between Normal mode and Fast mode?

What is the difference between Normal mode and Fast mode?
normal mode: runs your test or component with the execution arrow to the left of the keyword view or expert view, marking each step or statement as it is performed. If the test contains multiple actions, the tree in the keyword view item column expands to display the steps, and the expert view displays the script, of the currently running action. You must have microsoft script debugger installed to enable this mode. fast mode. Runs your test or component without the execution arrow to the left of the keyword view or expert view (for tests) and does not expand the item tree or display the script of each action as it runs. This option requires fewer system resources
What is the Obect Repository type
Object Repository: 2 types ( Per-action, Shared)
Per-Action: Default , but it is not reusable , used to that
current test only, Extension :- Mtr
Shared:its a reusable repository, we can use in multiple
scripts ,extension :- tsr
using this syntax : repositoriescollection.add("Path") we
can use int script itself

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