Bad performance due to bad Internet connection.
To improve performance on browsers with poor connections, adapt your web application server configuration.
Example: Tomcat
Make sure that Tomcat uses the NIO2 connector and that the upload timeout attribute is enabled.
To do this, open the <Tomcat>/conf/server.xml file and edit it as follows:
Before:
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
After:
<Connector port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol"
connectionTimeout="20000"
redirectPort="8443"
disableUploadTimeout="false"
connectionUploadTimeout="10000"/>