Vue 3 performance is very low when compared to Vue 2

[VishnuVarsan]

Scenario

I have created a Grid component and updated the column and row on the mounted event dynamically based on the data source. The performance issue occurs in a in a large number of the data sources.

Does this is due to the Vue 3's reactivity behaviour? If yes, share the solution to improve the performance as well as Vue 2. Otherwise, kindly provide the cause for the performance issue.