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YASR causing excessive disk i/o

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Hi,
Lately, possibly since the 1.6.2 update, we’ve been getting spikes in CPU and disc i/o on our server, which we’ve tracked down to YASR sql activity (see below). Any ideas why this is happening and what we can do to stop it?
Thanks
Ken

mysql> show processlist;
+——-+———–+———–+———–+———+——+———-+——————————————————————————————————+
| Id | User | Host | db | Command | Time | State | Info |
+——-+———–+———–+———–+———+——+———-+——————————————————————————————————+
| 86639 | wordpress | localhost | wordpress | Query | 1 | updating | DELETE FROM wp_options
WHERE option_name LIKE ‘_transient_yasr_get_multi_set_values_and_field_%’
|
+——-+———–+———–+———–+———+——+———-+——————————————————————————————————+


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