React Scheduler slow editing with many cells

[MaximKudriavtsev]

• I have searched this repository's issues and believe that this is not a duplicate.

I'm using ...

• React Grid
• React Chart
• React Scheduler

Current Behaviour

Slow editing with a lot of cells

Expected Behaviour

Fast editing

Steps to Reproduce

https://codesandbox.io/s/naughty-newton-114lm?file=/demo.js

• devextreme-reactive: 2.6.4
• react: 16.13.1

Internal ticket

[MaximKudriavtsev]

We have released the 2.7.0 version of DevExtreme Reactive Scheduler with these improvements.