Hello guys!
Previously I could live and build docker images, could handle a lot of tabs in chrome, but when I upgraded last time gentoo, the performance of KDe decreased a lot. And seems like not only performance of KDE. I can't execute as fast as before my python project integration tests. The system is very slow. Previously there was an error that kde couldn't find libpng. I did revdep-rebuild for library libpng. Now it's gone(oh, it's not gone).
Could you please give any clues ?
I created another user but seems like problem still persists.
Issues from xorg-session.log:
1

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kf.notifications: env says KDE is running but SNI unavailable -- check KDE_FULL_SESSION and XDG_CURRENT_DESKTOP


2.

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org.kde.kmix: Cannot load profile "PulseAudio.Playback_Devices.1.default"
org.kde.kmix: Cannot load profile "PulseAudio.Capture_Devices.1.default"
org.kde.kmix: Cannot load profile "PulseAudio.Playback_Streams.1.default"
org.kde.kmix: Cannot load profile "PulseAudio.Capture_Streams.1.default"
org.kde.kmix: no mix devices and not dynamic


3.

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Cyclic dependency detected between "file:///usr/lib64/qt5/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml" and "file:///usr/lib64/qt5/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml"


4.

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file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"


5.

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org.kde.pim.google: Got error: KGAPI2::ContactsGroupFetchJob(0x558af4efc400) "Invalid response content type"
org.kde.pim.google: Got error: KGAPI2::CalendarFetchJob(0x558af4f2f5c0) "Invalid response content type"
org.kde.pim.google: Got error: KGAPI2::TaskListFetchJob(0x558af4f58350) "Invalid response content type"
kf.sonnet.core: No language dictionaries for the language: "en_US" trying to load en_US as default
kf.sonnet.core: No language dictionaries for the language: "en_US"


6.

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org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f38181ab6c0) )
[00007f4630004190] cache_read stream error: cannot pre fill buffer
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f3818181cd0) )
[00007f4630000fb0] mjpeg demux error: cannot peek


7.

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org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f38181ab6c0) )
[00007f4630004190] cache_read stream error: cannot pre fill buffer
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f3818181cd0) )
[00007f4630000fb0] mjpeg demux error: cannot peek


8.

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fixme:service:scmdatabase_autostart_services Auto-start service L"clr_optimization_v4.0.30319_32" failed to start: 1053
err:module:load_builtin_dll failed to load .so lib for builtin L"winebus.sys": libudev.so.0: cannot open shared object file: No such file or directory
err:winedevice:async_create_driver failed to create driver L"WineBus": c0000142
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f38180e1920) identified as "AgentBaseChangeRecorder - 94627825788176


9. Hm, libpng issue is still here:

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err:wincodecs:PngEncoder_CreateInstance Failed writing PNG because unable to find libpng12.so.0
fixme:ole:CoCreateInstanceEx no instance created for interface {00000103-a8f2-4877-ba0a-fd2b6645fb94} of class {27949969-876a-41d7-9447-568f6a35a4dc}, hres is 0x80004005


10. emerge --info kwin

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pc-19 ~ # emerge --info kwin
Portage 3.0.13 (python 3.7.9-final-0, default/linux/amd64/17.1/desktop/plasma, gcc-10.2.0, glibc-2.32-r7, 5.10.7-gentoo x86_64)
=================================================================
                         System Settings
=================================================================
System uname: Linux-5.10.7-gentoo-x86_64-Intel-R-_Core-TM-_i5-4440_CPU_@_3.10GHz-with-gentoo-2.7
KiB Mem:    28660048 total,  21708012 free
KiB Swap:    2929660 total,   2929660 free
Timestamp of repository gentoo: Sun, 31 Jan 2021 17:00:01 +0000
Head commit of repository gentoo: 012a54e828b9fd9c0a7a6f2f4c3960dac380b6fa
Timestamp of repository poly-c: Sat, 04 Jan 2020 11:55:30 +0000
sh bash 5.1_p4
ld GNU ld (Gentoo 2.35.1 p2) 2.35.1
app-shells/bash:          5.1_p4::gentoo
dev-java/java-config:     2.3.1::gentoo
dev-lang/perl:            5.32.0-r1::gentoo
dev-lang/python:          2.7.17-r100::stefantalpalaru, 3.6.12-r1::gentoo, 3.7.9-r1::gentoo, 3.8.7::gentoo, 3.9.1::gentoo
dev-util/cmake:           3.19.3::gentoo
sys-apps/baselayout:      2.7-r1::gentoo
sys-apps/openrc:          0.42.1::gentoo
sys-apps/sandbox:         2.20::gentoo
sys-devel/autoconf:       2.13-r1::gentoo, 2.69-r5::gentoo
sys-devel/automake:       1.13.4-r2::gentoo, 1.15.1-r2::gentoo, 1.16.3-r1::gentoo
sys-devel/binutils:       2.35.1-r1::gentoo
sys-devel/gcc:            4.4.7-r3::gentoo, 5.5.0::gentoo, 10.2.0-r5::gentoo
sys-devel/gcc-config:     2.3.2-r1::gentoo
sys-devel/libtool:        2.4.6-r6::gentoo
sys-devel/make:           4.3::gentoo
sys-kernel/linux-headers: 5.10::gentoo (virtual/os-headers)
sys-libs/glibc:           2.32-r7::gentoo
Repositories:

gentoo
    location: /var/db/repos/gentoo
    sync-type: rsync
    sync-uri: rsync://rsync.gentoo.org/gentoo-portage
    priority: -1000
    sync-rsync-verify-jobs: 1
    sync-rsync-verify-metamanifest: yes
    sync-rsync-verify-max-age: 24
    sync-rsync-extra-opts:

local
    location: /usr/local/portage/overlay
    masters: gentoo
    priority: 0

ArtSoftware
    location: /var/lib/layman/ArtSoftware
    masters: gentoo
    priority: 50

AstroFloyd
    location: /var/lib/layman/AstroFloyd
    masters: gentoo
    priority: 50

R_Overlay
    location: /var/lib/layman/R_Overlay
    masters: gentoo
    priority: 50

chrytoo
    location: /var/lib/layman/chrytoo
    masters: gentoo
    priority: 50

dotnet
    location: /var/lib/layman/dotnet
    masters: gentoo
    priority: 50

eclipse
    location: /var/lib/layman/eclipse
    masters: gentoo
    priority: 50

fordfrog
    location: /var/lib/layman/fordfrog
    masters: gentoo
    priority: 50

gamerlay
    location: /var/lib/layman/gamerlay
    masters: gentoo
    priority: 50

go-overlay
    location: /var/lib/layman/go-overlay
    masters: gentoo
    priority: 50

hering-overlay
    location: /var/lib/layman/hering-overlay
    masters: gentoo
    priority: 50

hossie
    location: /var/lib/layman/hossie
    masters: gentoo
    priority: 50

jorgicio
    location: /var/lib/layman/jorgicio
    masters: gentoo
    priority: 50

linxon
    location: /var/lib/layman/linxon
    masters: gentoo
    priority: 50

lua
    location: /var/lib/layman/lua
    masters: gentoo
    priority: 50

mva
    location: /var/lib/layman/mva
    masters: gentoo
    priority: 50

pf4public
    location: /var/lib/layman/pf4public
    masters: gentoo
    priority: 50

poly-c
    location: /var/lib/layman/poly-c
    masters: gentoo
    priority: 50

raiagent
    location: /var/lib/layman/raiagent
    masters: gentoo
    priority: 50

science
    location: /var/lib/layman/science
    masters: gentoo
    priority: 50

scrill
    location: /var/lib/layman/scrill
    masters: gentoo
    priority: 50

snapd
    location: /var/lib/layman/snapd
    masters: gentoo
    priority: 50

ssnb
    location: /var/lib/layman/ssnb
    masters: gentoo
    priority: 50

steam-overlay
    location: /var/lib/layman/steam-overlay
    masters: gentoo
    priority: 50

stefantalpalaru
    location: /var/lib/layman/stefantalpalaru
    masters: gentoo
    priority: 50

stuff
    location: /var/lib/layman/stuff
    masters: gentoo
    priority: 50

vowstar
    location: /var/lib/layman/vowstar
    masters: gentoo
    priority: 50

waebbl
    location: /var/lib/layman/waebbl
    masters: gentoo raiagent
    priority: 50

ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=native -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/sddm/scripts/Xsetup"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-march=native -O2 -pipe"
DISTDIR="/var/cache/distfiles"
ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR"
FCFLAGS="-march=native -O2 -pipe"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch preserve-libs protect-owned qa-unresolved-soname-deps sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-march=native -O2 -pipe"
GENTOO_MIRRORS="ftp://ftp.wh2.tu-dresden.de/pub/mirrors/gentoo"
LANG="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j4"
PKGDIR="/var/cache/binpkgs"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git"
PORTAGE_TMPDIR="/var/tmp"
USE="X a52 aac acl acpi activities alsa amd64 berkdb bluetooth branding bzip2 cairo cdda cdr cli connection-sharing crypt cups dbus declarative dri dts dvd dvdr elogind emboss encode exif flac fortran gdbm gif gui iconv icu ipv6 jpeg kde kipi kwallet lcms libglvnd libnotify libtirpc lm_sensors mad mng mp3 mp4 mpeg mtp multilib ncurses networkmanager nls nptl ogg opengl openmp pam pango pcre pdf phonon plasma png policykit ppds pulseaudio qml qt5 readline scanner sdl seccomp semantic-desktop spell split-usr ssl startup-notification svg tahoma tcpd tiff truetype udev udisks unicode upower usb v4l vorbis widgets wifi wxwidgets x264 xattr xcb xml xv xvid zlib" ABI_X86="64" ADA_TARGET="gnat_2018" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="karbon sheets words" CAMERAS="*" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="mmx mmxext sse sse2" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="efi-64" INPUT_DEVICES="synaptics evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-3 php7-4" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_8" PYTHON_TARGETS="python2.7 python3_6 python3_7 python3_8" RUBY_TARGETS="ruby26" SANE_BACKENDS="hp" USERLAND="GNU" VIDEO_CARDS="amdgpu radeonsi radeon intel vmware" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset:  CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

=================================================================
                        Package Settings
=================================================================

kde-plasma/kwin-5.20.5::gentoo was built with the following:
USE="handbook -accessibility -caps -debug -gles2-only -multimedia -screencast -test" ABI_X86="(64)"
FEATURES="binpkg-logs userfetch unknown-features-warn usersandbox usersync parallel-fetch news qa-unresolved-soname-deps ipc-sandbox assume-digests sfperms binpkg-docompress config-protect-if-modified fixlafiles multilib-strict xattr network-sandbox merge-sync distlocks ebuild-locks strict unmerge-orphans binpkg-dostrip unmerge-logs userpriv sandbox preserve-libs protect-owned"