Linq query embeds a subquery when I don't think it's necessary -- optimization? - performance

Question

I have a linq query that I'm trying to speed up.
List<WorkloadDTO> workload = _context.vwData.AsNoTracking()
.Join(_context.AppUsers, vis => vis.AssignedToAppUserID, us => us.AppUserId,
(vis, us) => new
{
vis.GroupID,
vis.FacilityIsActive,
vis.ClientIsActive,
vis.GroupIsActive,
vis.IsClosedAccount,
vis.AssignedToAppUserID,
us.AppUserName,
us.AppUserDisplayName
}
)
.Where(i => i.GroupID == 1 && i.FacilityIsActive && i.ClientIsActive && i.GroupIsActive && !i.IsClosedAccount)
.GroupBy(g => new { g.AssignedToAppUserID, g.AppUserName, g.AppUserDisplayName },
(key, group) => new {
AssignedToAppUserID = key.AssignedToAppUserID,
AssignedTo = key.AppUserName,
AssignedDisplayName = key.AppUserDisplayName,
Count = group.Count()
})
.Select(s => new WorkloadDTO
{
AppUserId = s.AssignedToAppUserID,
UserName = s.AssignedTo,
DisplayName = s.AssignedDisplayName,
Count = s.Count
}).Distinct().OrderBy(o => o.UserName).ToList();
It generates the following query:
SELECT [t].[AppUserId], [t].[UserName], [t].[DisplayName], [t].[Count]
FROM (
SELECT DISTINCT [v].[AssignedToAppUserID] AS [AppUserId], [a].[AppUserName] AS [UserName], [a].[AppUserDisplayName] AS [DisplayName], COUNT(*) AS [Count]
FROM [vwData] AS [v]
INNER JOIN [AppUser] AS [a] ON [v].[AssignedToAppUserID] = [a].[AppUserId]
WHERE (((([v].[GroupID] = 1) AND ([v].[FacilityIsActive] = CAST(1 AS bit))) AND ([v].[ClientIsActive] = CAST(1 AS bit))) AND ([v].[GroupIsActive] = CAST(1 AS bit))) AND ([v].[IsClosedAccount] = CAST(0 AS bit))
GROUP BY [v].[AssignedToAppUserID], [a].[AppUserName], [a].[AppUserDisplayName]
) AS [t]
ORDER BY [t].[UserName]
It seems to me that the nesting selects are not necessary. I'm looking for suggestions on how to write the linq query so that it instead results in:
SELECT DISTINCT [v].[AssignedToAppUserID] AS [AppUserId], [a].[AppUserName] AS [UserName], [a].[AppUserDisplayName] AS [DisplayName], COUNT(*) AS [Count]
FROM [vwData] AS [v]
INNER JOIN [AppUser] AS [a] ON [v].[AssignedToAppUserID] = [a].[AppUserId]
WHERE (((([v].[GroupID] = 1) AND ([v].[FacilityIsActive] = CAST(1 AS bit))) AND ([v].[ClientIsActive] = CAST(1 AS bit))) AND ([v].[GroupIsActive] = CAST(1 AS bit))) AND ([v].[IsClosedAccount] = CAST(0 AS bit))
GROUP BY [v].[AssignedToAppUserID], [a].[AppUserName], [a].[AppUserDisplayName]
ORDER BY [a].[AppUserName]