Performance problems with sap.m.table component

We have developed a webpage using ui5 under xsengine. If we use sap.m. table with more than 50 records web page is very very slow, load times are huge. Nevertheless, If we change the component and we use sap.ui.table, it works perfectly.

Is there any technical reason for so bad performance on sap.m.table component? Is there any related bug or info?

We are using version 1.52.17

Kind regards,

Javi