Well, just as reference my wndr3700v2 of similar vintage had no problems with all of this (modulo the DSL) at 50/10. My point is that HH5A really is not a high performance platform, and as attractive a single all-in-one router is, the HH5A only cuts it for low speeds IMHO.
That is as understandable as it is risky. Mind you for a bridged-modem where to control GUI is not reachable over the internet running an old version is IMHO less critical than for a primary router.
True, but there are slightly more modern lantiq SoCs that are supported with a few additional patches like the vrx518 that are not as old as the xrx200 in the HH5A. I have no direct experience how well something like a fritzbox 7530 will actuall di as all-in-one dsl router though, but I expect the 4 core ARM cpu to be a tad better than the HH5A's.
I agree with you, this box is a budget router. But with 21.03 it was fast enough for my (our) purpose.
That's for sure.
I do hope, 21.03.5 is safe enough for the moment.
On the other hand, when i think about the millions of ISP-routers with their outdated, sometimes even critical firmware i get the creeps.
Well then, a used Fritzbox 7520 is on its way. The image is already built, i'm eager to see how much resources will be left over with 22.03 on this box.
I made this build if you want to test, it's latest master. Just backup your current config and go for config wipe when flashing and then when going back just do a config wipe again and then restore your old config. I made this build with -march=34kc so one small drawback is a little bit of speed loss on unaccelerated openssl but other than that it should be ok to route at least 100mbits/s. Also no dsl blob is included so you'll have to 'scp -O ...' one on yourself.
Under the status menu there's a new " DSL line spectrum " section with a bunch of graphs
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Thank you.
I'll try this one on the weekend (hopefully), but for the moment i'm into the FB7520 i got today.
Just for the speed of response (especially on LuCI) i can see that this box is much faster than the HH5A.
But there may be a neighbor who would like to replace his much older router with one of my HH5A.
@wilsonyan
It's difficult to switch the router and test new builds when there's always someone in the family who needs the internet connection right now very urgent 
.
Well, now i had some time and did a quick check on your build:
The maximum download speed via VDSL w/ default configuration is approx. 7460 kByte/s.
With enabled packet steering it goes up a little bit to approx. 7770 kByte/s.
When i assign xrx200_net_rx on irq72 to VPE1 instead of VPE0 with
echo 2 > /proc/irq/72/smp_affinity
i'll get a download speed up to approx. 9900 kByte/s.
So there's no big difference compared to my build based on 22.03.0 and the official image build on 22.03.2.
It's still slower than with 21.03.5, where i can reach up to approx. 11.500 kByte/s.
I assume, OW 22.03 just needs more (cpu-)power to achieve the same results as 21.02.
But the HH5A is at its limit, and so it throttles the data throughput.
So, if anybody wants the maximum data rate with a HH5A, [s]he should stay on 21.02.
Or make a clean brake and switch to a stronger device (like i did with the Fritz!Box 7520).
Anyway, thank you for your efforts. But sorry, no cigar. 
yeah I guess the ultimate trick would be to keep the old pre-dsa drivers with the patches that were released here to make it faster with the latest 5.15 kernel or something. The DSA driver is cool and all but by the time you have the hh5a running a DSA bridge and then a br-lan bridge on top of it the performance is definitely worse than just being able to have 1 br-lan bridge and use the swconfig for vlans. Though it seems like you can get around it by just making vlan devices off the individual ports to avoid having 2 bridges. Also it seems like the backported BPF mips32r2 stuff may not quite be all there for some things, I had to remove the bridger daemon because it segfaults sometimes on link up and down. I'm not sure where you get the speed limits there, as with that build I'm pretty sure I was able to download at over 10 megabytes/sec from my provider and speedtest showed about 94 megabits/sec download.
but yeah the fritz 7530/7520 devices are working great now anyway thanks to work by janh and dhewg, the extra sync rate for me alone is a lot better, it's 103.5 vs 112.
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Modem only operations are bread and butter of lantiq those days. DSA and mini jumbo frames allows to be more creative. Like using AP and network switch to expand local network while keeping modem operations on lantiq but routing and sqm on other device .
update: my FB7362SL used in this mode barely hit 40% in this monthly usage stat:
I'm also using IRQ remap ethernet and wireless to 2nd core while 1st handling VDSL operations
echo 2 > /proc/irq/144/smp_affinity
echo 2 > /proc/irq/72/smp_affinity
echo 2 > /proc/irq/73/smp_affinity
