I am new to linq query my linq query shown below taking long time to execute,

List<InventoyModel> vehic = new List<InventoyModel>();

 vehic = Winv.Select(x => new InventoyModel
                    {
                        InvID = x.Id,
                        WeaponBrand = WH.LKP_WeaponBrand.Where(b => b.BrandID == x.WeaponBrand).Select(b => b.BrandName).FirstOrDefault(),
                        LKP_WeaponBrand = x.WeaponBrand,
                        weaponModel = WH.LKP_WeaponModel.Where(m => m.ModelID == x.weaponModel).Select(b => b.ModelName).FirstOrDefault(),
                        LKP_WeaponModel = x.weaponModel,
                        WeaponType = WH.LKP_WeaponType.Where(b => b.TypeID == x.WeaponType).Select(b => b.WeaponName).FirstOrDefault(),
                        EntityCategoryID = x.EntityCategoryID,
                        // LKP_WeaponType=x.WeaponType,
                        SerialNo = x.Serial,
                        //LKP_WeaponSerial=x.Serial,
                        MadeOf = WH.LKP_BrandOrigin.Where(b => b.ID == x.MadeOf).Select(b => b.CountryName).FirstOrDefault(),
                        // LKP_BrandOrigin=Convert.ToInt32(x.MadeOf),
                        BulletCount = x.BuletCount,
                        AssignerCategoryID = x.AssignerCategoryID,
                        WeaponNote = x.Note,
                        EntityType = x.EntityType,
                        AssignedBy = x.AssignedBy,
                        EntityStatusName = WH.LKP_EntityStatus.Where(l => l.StatusID == x.EntityStatus).Select(l => l.Status).FirstOrDefault(),
                        IsFile = x.IsFile,
                        MarkazName = x.MarkazName,
                        MahafzaName = x.MahafzaName,
                        NID = x.EmpId.ToString().Trim(),
                        Datetime = x.Date,
                        UpdateDate = x.ModifyDate,
                        ModifierName = x.ModifyBy,
                        EntityQty = x.WeaponQty,
                        SCEntityQty = 0
                    }).ToList();

I know actually i am using many query inside query to get values creating problem but i dont know how to solve it.

Hopes for your suggestion
thanks