# Percona Server for MYSQL 8.0 very slow performance on all myISAM tables **URL:** \ **Category:** Percona Server for MySQL 8.0\ **Created:** [January 7, 2025, 5:14pm UTC](https://forums.percona.com/t/percona-server-for-mysql-8-0-very-slow-performance-on-all-myisam-tables/36010 "2025-01-07T17:14:10Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Dario\_Rigolin](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/dario_rigolin/32/16798_2.png) [@Dario\_Rigolin](https://forums.percona.com/u/Dario_Rigolin)\ **Post date:** [January 7, 2025, 5:14pm UTC](https://forums.percona.com/t/percona-server-for-mysql-8-0-very-slow-performance-on-all-myisam-tables/36010/1 "2025-01-07T17:14:10Z")
Is quite strange but mysqldump and also alter table to convert to InnoDB are very slow but very very slow. For example converting a table of 5800 rows from myisam to innodb requires about 35 minutes. Server is running on a LXC container proxmox with a ZFS storage. But Innodb Tables on the same server are very fast and doesn’t have any issue. I have all myISAM variables at default, I didn’t change anything from default but maybe some other conf can make myisam engine very slow. Also mysqldump of tables to reimport them with innodb engine is very slow. Anybody had a similar issue? ---
**Author:** ![matthewb](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/matthewb/32/34_2.png) [@matthewb](https://forums.percona.com/u/matthewb)\ **Post date:** [January 7, 2025, 6:24pm UTC](https://forums.percona.com/t/percona-server-for-mysql-8-0-very-slow-performance-on-all-myisam-tables/36010/2 "2025-01-07T18:24:38Z")
During the ALTER process, what else is in SHOW PROCESSLIST? What does your CPU/DiskIO look like during the ALTER? Same goes for the mysqldump restore. Sounds like your InnoDB settings might be non-best-practice. Provide your my.cnf