Speeding up an incredibly slow sshfs going through login ssh tunnel

Sorry if this is answered somewhere and I have missed it. I lack some understanding in how these things work in order to safely choose the best solution.

I, like many others, am working from home.

I work with large data files, and have access to reasonably powerful computing resources to process data. For a long time I was using a vnc-viewer to work remotely but for various reasons it got really annoying to use and I started searching for an alternative.

I came across sshfs and it seems like the ideal choice. I work on mounted code/etc. remotely, with the creature comforts of my own PC/desktop set up, and then execute scripts remotely over ssh. I can then open remote plots etc of processed data locally.

I mount using sshfs remote-node:/home/me ~/work_sshfs/ -o follow_symlinks which I have configured in my ~/.ssh/config file as:

Host login
        HostName login.server.com
        User usrname
        PasswordAuthentication true

Host remote-node
        HostName remote-node
        User usrname
        ProxyJump login

This works well, however when it comes to opening mounted processed files it can be really slow. I have pretty good internet (Downs/Ups of 390/35Mbps) but when I am opening a file and watching nethogs I see max down-speeds of ~24Mbps. I also know from testing that the remote network’s upload (~1 Gbps) is not the bottleneck.

From what I’ve read online I understand that the encryption overhead for sshfs (or just ssh) seems to be the bottleneck.

Finally the question: Does the fact I mount through a tunnel ‘multiply’ the effects of this? If yes, Is it possible to ‘soften’ the encryption on the "login-portal <– remote node" step of the mount?

These are on the "same" network which require login credentials to gain access to so I wouldn’t be too nervous about relaxing this. I would however want good encryption over the internet.

Sorry for the large amount of detail – I wanted to give context in case there is another solution, or something glaring I am missing.

Thanks in advance!

EDIT 1: Traceroute to login server

traceroute to <login-server> (130.209.45.188), 30 hops max, 60 byte packets
 1  _gateway (192.168.0.1)  1.926 ms  2.581 ms  3.472 ms
 2  * * *
 3  renf-core-2a-xe-910-0.network.*.net (62.***.70.**)  18.956 ms  19.265 ms  19.605 ms
 4  * * *
 5  * * *
 6  * * *
 7  m674-mp2.*.lis.dial.*.net (62.*.*.162)  29.575 ms  29.989 ms  30.278 ms
 8  213.*.182.* (213.*.182.*)  38.575 ms  28.813 ms  33.320 ms
 9  *.telia.net (62.*.*.194)  33.623 ms *.telia.net (62.*.*.64)  28.854 ms *.telia.net (62.*.*.194)  35.838 ms
10  *.telia.net (213.*.*.98)  40.601 ms *.telia.net (62.*.*.211)  39.466 ms *.telia.net (62.*.*.239)  29.877 ms
11  * * *
12  jisc-ic-345131-ldn-b4.*.telia.net (*.*.*.131)  32.555 ms  27.628 ms  27.547 ms
13  ae24.*.ja.net (*.97.*.197)  31.632 ms  32.018 ms  27.961 ms
14  ae29.*.ja.net (*.97.*.2)  28.146 ms  32.859 ms  32.976 ms
15  ae31.*.ja.net (*.97.*.22)  33.075 ms  30.615 ms  40.368 ms
16  ae29.*.ja.net (*.*.33.42)  40.937 ms  37.516 ms  48.620 ms
17  ae31.*.ja.net (*.97.*.54)  39.851 ms  46.164 ms  47.362 ms
18  ae26.*.ja.net (*.97.*.26)  47.668 ms  47.919 ms  46.603 ms
19  *.97.*.2 (*.97.*.2)  56.201 ms  47.390 ms  46.254 ms
20  * * *
21  * * *
22  * * *
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