Hi Toko,
The loading time of Syncfusion components depends on the component’s style and script files. We suggest you refer the styles of the required component alone to improve the performance.
We have created a react sample to render grid component with the style files of grid component alone. In the sample created the loading time is approximately 1.51s in both development and production.
Please find the below screenshot for your reference.
We have also attached the sample created for your reference and the same can be referred from the below link.
Please let us know if you have any concerns.
Regards,
Jayakumar D