There are too many free cloud servers available which you can use to deploy your web apps and test your high performance services for free. Consider these free google cloud server services..
App Engine - 28 frontend instance hours per day, 9 backend instance hours per day, Platform for building scalable web applications and mobile back ends.
Cloud Firestore - 1GB storage, 50,000 reads, 20,000 writes, 20,000 deletes per day, NoSQL document database that simplifies storing, syncing, and querying data for apps.
Compute Engine - 1 non-preemptible e2-micro, 30GB HDD, 5GB snapshot storage (restricted to certain regions), 1 GB network egress from North America to all region destinations (excluding China and Australia) per month. High-performance & Scalable virtual machines.
Cloud Storage - 5GB, 1GB network egress
Cloud Shell - Web-based Linux shell/basic IDE with 5GB of persistent storage. 60 hours limit per week
Cloud Pub/Sub - 10GB of messages per month
Cloud Functions - 2 million invocations per month (includes both background and HTTP invocations)
Cloud Run - 2 million requests per month, 360,000 GB-seconds memory, 180,000 vCPU-seconds of compute time, 1 GB network egress from North America per month
Google Kubernetes Engine - No cluster management fee for one zonal cluster. Each user node is charged at standard Compute Engine pricing
BigQuery - 1 TB of querying per month, 10 GB of storage each month
Cloud Build - 120 build-minutes per day
Cloud Source Repositories - Up to 5 Users, 50 GB Storage, 50 GB Egress
Google Colab - Free Jupyter Notebooks development environment.
For All Free Google cloud free features with complete details visit Google Cloud