Make nodes graph animations a bit faster

[fbarl]

From Slack conversation (referring to animation speed changes in #2795):

matthias [11:52 PM] 
TBH, it's a bit too snappy for me now. 
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matthias [11:54 PM] 
does it not defeat the purpose of the animations?
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jordan
[11:55 PM] 
yeah might be a little fast
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matthias [11:57 PM] 
I don't think animations need to be quite as lethargic as before. somewhere in between.

[rndstr]

@rade asked me to take a look and for me when comparing to the previous speed it is an improvement. The animations I couldn't follow previously are now a bit easier on the eye.