dynamic - There is an issue with Manipulate in which it updates its argument twice in V10

I have asked this question before (here) and I thought that the issue is only when moving the Notebook window.

It appears that Manipulate is working in weird manner.

data = RandomReal[100, {10000, 10}];
Manipulate[
 Grid[{{RandomReal[100]}, {ListPlot[data[[;; , i]], 

     PlotLabel -> RandomReal[100], ImageSize -> 400, 
     PlotStyle -> Hue[RandomReal[1]]]}}], {i, 1, 10, 1}]

Manipulate updates its argument twice even if the window is static without moving.

enter image description here

This is really creates a big problem for me and all codes done in V9 are very slow running in V10.

Any help will be highly appreciated.

Update:

the suggested solution by Sjoerd C. de Vries works in this case but not in general as shown in this example:

Manipulate[

 a = Log[i];
 Grid[{{RandomReal[100]}, {ListPlot[a data[[;; , i]], 
     PlotLabel -> RandomReal[100], ImageSize -> 400, 
     PlotStyle -> Hue[RandomReal[1]], 
     PerformanceGoal -> "Quality"]}}], {i, 2, 10, 1}]

Thank you

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