diff --git a/main.go b/main.go
index 6b00d69..119ee6e 100644
--- a/main.go
+++ b/main.go
@@ -11,7 +11,6 @@ import (
 	"time"
 
 	"github.com/lpar/gzipped/v2"
-	"github.com/muety/wakapi/models"
 	"github.com/muety/wakapi/routes/relay"
 
 	"github.com/emvi/logbuch"
@@ -269,18 +268,6 @@ func main() {
 		middlewares.NewFileTypeFilterMiddleware([]string{".go"})(staticFileServer),
 	)
 
-	// Miscellaneous
-	// Pre-warm projects cache
-	if !config.IsDev() {
-		allUsers, err := userService.GetAll()
-		if err == nil {
-			logbuch.Info("pre-warming user project cache")
-			for _, u := range allUsers {
-				go heartbeatService.GetEntitySetByUser(models.SummaryProject, u)
-			}
-		}
-	}
-
 	// Listen HTTP
 	listen(router)
 }
diff --git a/migrations/20220319_add_user_project_idx.go b/migrations/20220319_add_user_project_idx.go
new file mode 100644
index 0000000..ab38d0e
--- /dev/null
+++ b/migrations/20220319_add_user_project_idx.go
@@ -0,0 +1,35 @@
+package migrations
+
+import (
+	"fmt"
+	"github.com/emvi/logbuch"
+	"github.com/muety/wakapi/config"
+	"github.com/muety/wakapi/models"
+	"gorm.io/gorm"
+)
+
+func init() {
+	const name = "20220319-add_user_project_idx"
+	f := migrationFunc{
+		name: name,
+		f: func(db *gorm.DB, cfg *config.Config) error {
+			if hasRun(name, db) {
+				return nil
+			}
+
+			idxName := "idx_user_project"
+
+			if !db.Migrator().HasIndex(&models.Heartbeat{}, idxName) {
+				logbuch.Info("running migration '%s'", name)
+				if err := db.Exec(fmt.Sprintf("create index %s on heartbeats (user_id, project)", idxName)).Error; err != nil {
+					logbuch.Warn("failed to create %s", idxName)
+				}
+			}
+
+			setHasRun(name, db)
+			return nil
+		},
+	}
+
+	registerPostMigration(f)
+}
diff --git a/models/heartbeat.go b/models/heartbeat.go
index 71f8dc8..9922cfb 100644
--- a/models/heartbeat.go
+++ b/models/heartbeat.go
@@ -11,11 +11,11 @@ import (
 type Heartbeat struct {
 	ID              uint64     `gorm:"primary_key" hash:"ignore"`
 	User            *User      `json:"-" gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;" hash:"ignore"`
-	UserID          string     `json:"-" gorm:"not null; index:idx_time_user"`
+	UserID          string     `json:"-" gorm:"not null; index:idx_time_user,idx_user_project"` // idx_user_project is for quickly fetching a user's project list (settings page)
 	Entity          string     `json:"entity" gorm:"not null"`
 	Type            string     `json:"type"`
 	Category        string     `json:"category"`
-	Project         string     `json:"project" gorm:"index:idx_project"`
+	Project         string     `json:"project" gorm:"index:idx_project,idx_user_project"`
 	Branch          string     `json:"branch" gorm:"index:idx_branch"`
 	Language        string     `json:"language" gorm:"index:idx_language"`
 	IsWrite         bool       `json:"is_write"`