Lags in program using Custom Webview extension

Guys, the problem is when the custom webview starts to open the page in the application, no key does not work, that is, the program lags, please help

the author of the extension has been suspended in this community
for questions about the extension, please ask on his webpage here
http://sunnythedeveloper.epizy.com/2020/05/13/customwebview-an-extended-form-of-web-viewer/

Taifun