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Performance optimization

Romain requested to merge performance-opt into main

This PR introduces a number of small changes aiming at reducing the app's lag when handling more than 30 symbols.

Changes:

  • use key attribute for some React objects (helps the engine figure out which elements to re-render)
  • use slice in array updater function instead of costly iterations via map
  • use onBlur instead of onChange event triggering with TextFields (avoid lag after entering of individual characters)

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