On 11/05/2025 10:41, Jesper wrote:

For a week or two showing video on my Raspi 5 with NVME is impossible.
The framerate is now something like 2-3 seconds per frame.
Before the axe fell it went smooth, Youtube video, TV, videos in news
sites, no problem at all. The problem exists no matter if the connection
is via wifi or ethernet.
I have tested up- and download speed with Speeedtest.net. The results
are 50 to 52 Mb/s, and the connection is specified for 50/50 up and down.

I would look at what is running on the Pi. Use htop to see what
processes are using CPU. It will also show total memory used and if
there is any swap usage - which will kill the machines performance.

Per now this raspi is mostly used for checking news, and there is no
problem with that, except for embedded videos that run at 2-3 seconds
per frame. Pages load at normal speed.

Browsing is a memory hog. Have you tried immediately after rebooting and
before running any browser? What does the output of 'free' show?

I have used some test from Tom's hardware, using vcgencmd, as shown at
the bottom. https://www.tomshardware.com/how-to/raspberry-pi-benchmark-vcgencmd

I suspect it isn't anything hardware or power related as you would get
some outright failures rather just slowness.

There has been several updates coming in to the Raspi lately. I check
what is in the updates but often have no clue to what is does, and just
let it install. But if an update causes havoc like this, other people
would have been hit, and it probably would have been mentioned in this newsgroup.

It's always a good idea to do a backup before a major update, put that
on an SD card and see if the problem is with the older software.

It maybe something has been reconfigured such as going from Xorg to
Wayland display systems which your video playing app doesn't work
optimally with.

---druck

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druck <news@druck.org.uk> wrote:

On 12/05/2025 10:41, Jesper wrote:

Thank you for your reply. HTOP sems to be a great tool, but it will take some time to be familliar with it. A strange thing is I saw 45 lines
with /usr/lib/thunderbird/thunderbird listed with 5.7 % for MEM%. That
sums up to 250% :-) So I do not understand HTOP at all :-)

Browsers now run each tab as a separate process, so you will get many
lines of entries. Each process will share the read only code from the
first process, and have their own writeable data. Which is why they can
all add up to more than the total amount of memory in the machine, but actually only be using a much lower proportion.

I think htop also shows individual threads - the lines which have identical commands with identical amounts of RAM usage aren't separate processes,
they're multiple threads running inside the same address space. Since it's
one address space they all share the same RAM utilisation.

eg on this machine, the number of Firefox processes is:

$ ps -flye | grep firefox | wc -l
74

but the number of threads:

$ ps -flye -T | grep firefox | wc -l
2237

Theo

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