Anti-aliasing improves chart images by displaying jagged lines as smooth, and affects performance. In applications where performance is critical, use the server.xml setting to prevent charts from being anti-aliased.
To disable anti-aliasing:
In the section <properties>, copy and paste the string:
<property defid="0ad70321-0001-08aa-000000e738090110" name="DISABLE_ANTIALIASING">true</property>
<SERVICES app="bq">
...
<service type="BrioQuery">
...
<properties>
...
<property defid="0ad70321-0001-08aa-000000e738090110" name="DISABLE_ANTIALIASING">true</property>
...
</properties>
</service>
</SERVICES>