Fix node speed does not update

[asdacap]

Fix node speed does not update after some time as observation count increase. This means node that suddenly become slower does not get its speed reflected.

Changes:

• Uses different speed calculation.

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Other (please describe):

Testing

Requires testing

• Yes
• [] No

In case you checked yes, did you write tests??

• Yes
• No

Comments about testing , should you have some (optional)

Further comments (optional)

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[asdacap]

One node (lighthouse) stuck on forward sync due to other known issue. 3 other node synced and processing block, No clear improvement or regression.