Slow Query Performance in PouchDB with Synced CouchDB Index

I am experiencing slow query performance in PouchDB despite using an index synced from CouchDB. Below are the details of my setup and the issue:

### setup
### This is my index in CouchDB
{
"_id": "_design/employee-index",
"_rev": "9-853ffb68171b1e78206646d0a63c22bc",
"language": "query",
"views": {
"residents-index": {
"map": {
"fields": {
"firstName": "asc",
"projectId": "asc"
},
"partial_filter_selector": {}
},
"reduce": "_count",
"options": {
"def": {
"fields": [
"firstName",
"projectId"
]
}
}
}
}
}

### PouchDB sync
I have synced the above index from CouchDB to PouchDB.
The index appears in IndexedDB as _pouch_employee_mrview_. It has records.

### Query
db.find({
selector: {
projectId: 'specificProjectId',
firstName: { $gte: null }
},
use_index: '_design/employee-index'
}).then(function (result) {
console.log(result.docs);
}).catch(function (err) {
console.error(err);
});

### Issue
Despite using the use_index field in my query, the performance is still slow

### Info
- Environment: browser (using pouchdb-browser)
- Platform: (Chrome/FF/Safari/Edge/iOS/Android/etc.)
- Adapter: indexeddb
- Server: CouchDB

### My questions
1. Since I have created the Index at CouchDB and synced with PouchDB, Is it not using the Index properly?
2. Do I need to recreate the index using createIndex() from Pouch side? I queried the PouchDB index using getIndexes(). The index is available.
3. If I edit any field on PouchDB, Will that warm up the Index automatically.

Hi @maintainer, I would greatly appreciate it if you could take a look at this issue at your earliest convenience. The slow query performance is significantly impacting our application’s performance, and any guidance or suggestions would be immensely helpful. Thank you!