Speeding up CRM sync

Speeding up CRM sync

The syncing between Zoho CRM and invoice is just too slow. Imagine adding a customer in crm then creating an invoice. Do not rush it will not be ready. Change a customers details and want to reprint an invoice, grab a cup of tea. Add a new product and then try to do an invoice. Slow down speedy. Take it slowwwwwww.
Made the error of trying to change an account detail related to a customers invoice. Zoho Invoice never caught up. Gave up in the end and got the liquid paper out.
Zoho Invoice makes Zoho CRM great but the intergration sucks.
Instant sync
Accounts and contacts and I want this done properly contacts with no accounts included please.
Proper price books linked to Zoho CRM.