when you have a stored computed field with store=True, the system will attempt to compute and store the value of the field for all existing records when you first start the server after adding or modifying the field. This behavior can be problematic if you have a large number of records, as it can lead to timeouts or performance issues.

from odoo import models, fields, api

class MyModel(models.Model):
_name = 'my.model'

# Dependent fields
field1 = fields.Char()
field2 = fields.Integer()

# Computed field
computed_field = fields.Integer(compute='_compute_field', store=True, depends=['field1', 'field2'])

@api.depends('field1', 'field2')
def _compute_field(self):
for record in self:
# Compute the value for the field
record.computed_field = record.field1 + record.field2

In the example above, the computed_field depends on field1 and field2. When you start the server, Odoo will check if the values of fields 1 and field2 have changed since the last computation. If they haven't, it will skip the computation of the computed_field. This can help prevent the timeouts you're experiencing.