Long delay between platform event publish and platform event subscriber processing

Kindly help me with following scenario.

In short - need help to minimize the delay between platform event publish and platform event subscriber processing.

Platform Event Details -

• Event Type - High Volume
• Publish Behavior - Publish After Commit

Platform Event Subscriber Config

• batch Size - 20

Platform Event Subscriber

• Platform Event Trigger
• As per implementation done in "Platform Event Trigger",
• We are processing patform events in bulk.
• we are checking the per transaction governer limits like SOQL Limit, DML Limit are reached or not.
• When per transaction governer limits are about to be fulfilled - We are setting "Resume Check point" and breaking the bulk processing loop.
• As per our analysis - it can process upto 8 records per transaction.

We have a platform event in our org. as per details mentioned above and we have trigger as subscriber where processing happens.

• As per our analysis and understanding -
• Around 9000 Platform events are published per day.
• At the start of the day - when end user starts using the org. - the delay between platform event publish and platform event subscriber processing is minimal like 4 / 5 mins.
• But as the volume of the user and their activity increases as the day proceeds - the delay between platform event publish and platform event subscriber processing increases to 20 / 30 mins , 1 / 2 hours and it reaches to upto 6 / 7 hours at the end of the day.
• Also we tried creating 2 different platform events to acheive the same by distributing platform event publish load evenly. Even after this there is still delay of 4 / 5 hours

Kindly help me with the solution / design to minimize the deplay between publish and subscribe.  @Jayesh Bhatnagar  @Alex Pisani @Kate Vickery @Parth Vasani  @Mohith Shrivastava @Dominic Foster @Pranay Jaiswal