i tried editing my OP to add typical speeds, but the forum refused me permission, so here is that para 1 again, but with inclusion of speeds:
since installing
kdelinuxon HW recently i have been having persistent difficulties installing flatpaks in Discover or konsole [can take up to 30’ for any response to occur, & then download at excruciatingly slow few hundreds of kbps], & system updates have proven 100% impossible in Discover [timeout error message;Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.] & ~80% impossible in konsole [also timeout related errors, eg]. otoh my browsers work well, & ookla speedtests therein consistently report nice low ping & my expected ISP-contracted up/download speeds [>500/40 mbps].