Gantt 2.2.3 record limit

Hi everyone,

When using the Gantt 2.2.3 template, my Gantt appears only to count the first 1,000 or so rows of data, namely the first 1,000 groups of dates in a collective of users.

Is there a practical way to increase the maximum number of rows the chart can visualise? It would be ideal if I could do this without requiring admin access but if needs must, I can get my IT support team to intervene.

Thanks