diff --git a/.appveyor.yml b/.appveyor.yml
index a283cd2a34..ea5051668f 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -16,18 +16,13 @@ environment:
   global:
     CRAN: http://cloud.r-project.org
     WARNINGS_ARE_ERRORS: 1
-    R_CHECK_ARGS: --no-manual --no-multiarch
-    R_ARCH: i386
+    R_CHECK_ARGS: --no-manual
 # R_CHECK_ARGS specified in order to turn off --as-cran (on by default) as that can be slow
-# multiarch is on by default which (when R_ARCH: x64) compiles and tests both 32bit and 64bit in one x64 job
-# --no-multiarch so as to not run both 32bit and 64bit on every commit in PRs to save dev cycle time; GLCI after merge is full-strength
-# GHA has MacOS 64bit (test-coverage) and Ubuntu 64bit, therefore picked 32bit for Windows
-    GCC_PATH: mingw_64
-# Default GCC_PATH appears to be gcc-4.6.3 which is now unsupported as from Rtools.exe v3.4.
     _R_CHECK_NO_STOP_ON_TEST_ERROR_: true
 # continue tests even if some script failed
     _R_CHECK_TESTS_NLINES_: 0
 # Block truncation of any error messages in R CMD check
+# R is 64-bit only on Windows from 4.2.0 (prior default was build and test both 32bit and 64bit) so we no longer use R_ARCH to pick one to reduce CI time in PRs
 
   matrix:
 
diff --git a/inst/tests/tests.Rraw b/inst/tests/tests.Rraw
index f453b96208..275b74add4 100644
--- a/inst/tests/tests.Rraw
+++ b/inst/tests/tests.Rraw
@@ -14600,11 +14600,11 @@ oldenv1 = Sys.getenv("R_DATATABLE_NUM_PROCS_PERCENT")
 oldenv2 = Sys.getenv("R_DATATABLE_NUM_THREADS")
 Sys.setenv(R_DATATABLE_NUM_THREADS="")  # in case user has this set, so we can test PROCS_PERCENT
 Sys.setenv(R_DATATABLE_NUM_PROCS_PERCENT="3.0")
-test(1997.09, setDTthreads(), old, warning="Ignoring invalid.*Please remove any.*not a digit")
+test(1997.09, setDTthreads(), old, ignore.warning="Ignoring invalid.*Please remove any.*not a digit")
 new = getDTthreads()  # old above at (1) may not have been default. new now is.
 test(1997.10, getDTthreads(), new)
 Sys.setenv(R_DATATABLE_NUM_PROCS_PERCENT="1")
-test(1997.11, setDTthreads(), new, warning="Ignoring invalid.*integer between 2 and 100")
+test(1997.11, setDTthreads(), new, ignore.warning="Ignoring invalid.*integer between 2 and 100")
 test(1997.12, getDTthreads(), new)
 Sys.setenv(R_DATATABLE_NUM_PROCS_PERCENT="75")
 test(1997.13, setDTthreads(), new)