TRIPGEN time is too variable

[chintanp]

Sometimes tripgen is significantly slower. The reason for the same needs to be investigated in detail.

In the above example, the first 5 analyses and others used the same version of code.

[chintanp]

This is potentially due to high CPU utilization in the database when several simulations are launched in parallel. The culprit is the max_spacing query. Either it should be updated or the number of vCPUs increased (at least 10x increase in db cost).