The modality of the Editor's popups affects performance when multiple Editors are initialized or destroyed. Example: https://dojo.telerik.com/OZiHAzAn/4

Note that modality is turned on before initializing the Editors and turned off afterwards. This leads to a performance boost, more noticeable on destroying the Editors. Performance is worse, if modality is not set. For additional details see (Ticket ID: 1469512).

Research whether performance improvements are possible to implement in the Editor's source code, which will avoid having to switch popup modality as demonstrated in the linked example.