This kernel command line parameter didn't appear to help:

Moments after loading a new URL into firefox:

1  0            0       699176        17804      3699820    0    0     0     0 
2289  863   2   1  98   0   0
 0  0            0       702860        17804      3699780    0    0     0  2288 
 492 1817   0   1  99   0   0
 0  0            0       702860        17804      3699780    0    0     0     0 
 232  525   0   0 100   0   0
 0  0            0       703112        17804      3699748    0    0     0     0 
 220  564   0   0 100   0   0
 2  0            0       707792        17804      3699748    0    0     0     0 
 384  734   1   0  99   0   0
 0  0            0       712468        17804      3699996    0    0     0     0 
1005  854   2   0  97   0   0
 0  0            0       712500        17804      3699988    0    0     0  2308 
 497 1908   0   0  99   0   0
 0  0            0       712752        17804      3699748    0    0     0     0 
 240  567   0   0 100   0   0
 0  0          256       632540        17804      3763996    0  232     4   476 
1106 2138   2   1  96   0   0
 1  0         4352       649568        17804      3761060    0 2980     0  8132 
5030 17862   1   7  92   0   0
 1  0         7168       644588        17804      3758040    0 3032     0  9104 
5304 20299   0   7  93   0   0
 1  0        10240       654444        17804      3755152    0 2892     0 12864 
5367 21353   0   8  92   1   0
 1  0        13312       651200        17804      3752216    0 2932     0  8804 
5073 18847   0   5  95   0   0
 1  0        16128       660636        17804      3749200    0 3016     0  9048 
5183 19639   1   6  94   0   0
 0  0        18944       652444        17804      3746180    0 3020     0  9060 
5221 19613   0   5  95   0   0
 2  0        22016       645228        17804      3743168    0 3012     0  9032 
5219 20287   0   7  93   0   0
 0  0        25600       674648        17804      3740152    0 3016     0 11148 
5290 20518   0   7  93   0   0
procs -----------------------memory---------------------- ---swap-- -----io---- 
-system-- --------cpu--------
 r  b         swpd         free         buff        cache   si   so    bi    bo 
  in   cs  us  sy  id  wa  st
 1  0        28160       667968        17804      3737076    0 3076     0  9228 
5336 19913   0   7  93   0   0
 0  0        31488       663008        17804      3734048    0 3028     0  9084 
5377 19518   0   6  94   0   0
 2  0        34560       655620        17804      3731020    0 3028     0  9080 
5356 20395   0   7  93   0   0
 0  0        37632       649356        17804      3727996    0 3024     0  9076 
5258 19858   0   6  94   0   0
 1  0        40192       677924        17804      3724948    0 3064     0 11388 
5503 22313   0   8  92   0   0
 0  0        43264       670968        17804      3721944    0 3004     0  9016 
5211 19591   0   7  93   0   0
 2  0        46336       665016        17804      3718996    0 2948     0  8844 
5167 18978   0   7  93   0   0
 2  0        49664       658068        17804      3715896    0 3100     0  9300 
5304 20485   0   7  93   0   0
 1  0        52480       650784        17804      3712944    0 2984     0  8952 
5150 19377   0   5  95   0   0
 1  0        55296       677788        17804      3710012    0 2936     0 10892 
5300 20757   0   6  93   0   0
 1  0        58624       673908        17804      3707076    0 2932     0  6984 
4462 16264   0   4  96   0   0
 0  0        58880       670460        17804      3709260    0 1128     0  2260 
1968 6407   1   2  97   0   0
 0  0        58880       670552        17804      3709188    0    0     0     0 
 259  487   0   0 100   0   0
 0  0        58880       736572        17804      3643148    0    0     0     0 
 255  499   0   0 100   0   0
 0  0        58880       744792        17804      3642492    0    0     0  2124 
 535 2045   0   1  99   0   0
 0  0        58880       746520        17804      3642492    0    0     0     0 
 224  539   0   0 100   0   0
 0  0        58880       746236        17804      3642492    0    0     0     0 
 289  775   0   0 100   0   0
 0  0        58880       746032        17804      3642752    0    0     0     0 
 411  831   1   0  99   0   0
 0  0        58880       747872        17804      3642828    0    0     0   136 
 253  599   0   0 100   0   0
 0  0        58880       747916        17804      3642492    0    0     0  2360 
 510 1911   0   1  99   0   0
 0  0        58880       738084        17804      3652720    0    0     0     0 
 441 1131   0   0  99   0   0


$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu Focal Fossa (development branch)
Release:        20.04
Codename:       focal
$ cat /proc/cmdline 
BOOT_IMAGE=/BOOT/ubuntu@/vmlinuz-5.4.0-12-generic root=ZFS=rpool/ROOT/ubuntu ro 
root=ZFS=rpool/ROOT/ubuntu quiet splash acpi_osi=! "acpi_osi=Windows 2015" 
cgroup_disable=memory vt.handoff=1
$ uname -a
Linux millbarge 5.4.0-12-generic #15-Ubuntu SMP Tue Jan 21 15:12:29 UTC 2020 
x86_64 x86_64 x86_64 GNU/Linux

Thanks

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https://bugs.launchpad.net/bugs/1861359

Title:
  swap storms kills interactive use

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