A chromium regression update has been released for Debian GNU/Linux 10 to address an issue introduced by the previous update.

DSA 4714-2: chromium regression update

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Debian Security Advisory DSA-4714-2 security@debian.org
  https://www.debian.org/security/ Michael Gilbert
July 04, 2020   https://www.debian.org/security/faq
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Package : chromium
Debian Bug : 964145

The previous update for chromium released as DSA 4714-1 was mistakenly
built without compiler optimizations. This caused high CPU load and
frequent crashes. Updated chromium packages are now available that
correct this issue.

For the oldstable distribution (stretch), security support for chromium
has been discontinued.

For the stable distribution (buster), this problem has been fixed in
version 83.0.4103.116-1~deb10u2.

We recommend that you upgrade your chromium packages.

For the detailed security status of chromium please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/chromium

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/